U. S. DEPARTMENT of AGRICU BUREAU OF PLANT INDUSTRY B. 1 <; U.l.nu V.1 r.nnau CIRCULARS or Tin: BDREA INDUSTRY NOS. I TO INCLUSIVE, L908-1909. DSKJfaefift&Br U.S. DEPOSITORY \ <> L l M K I. WASHINGTON: QOA 1. 1:\MIA l l'i;i\ nNQ I »FFICE. L909. Digitized by the Internet Archive in 2013 http://archive.org/details/bureaOOunit CONTENTS. Page Circular No, I. Self-Boiled Lime-Sulphur Mixture is \ Promising l'l NGICIDE. Introduction 5 Sulphur as a fungicide 6 The B( If boiled lime-sulphur mixture 7 Preparation of the mixture 7 Apple bitter rot experiments * Experiments in the treatment of other apple diseases 11 Apple blotch 11 Apple leaf-spot l- Apple seal i 12 Experiments in the treatment of peach diseases 12 Peach brown-rol and scab 12 Peai h-leaf diseases 16 A combined fungicide and insecticide 16 Etai -i I .I,- usefulness 17 Circular No. 2. An Improved Method of Separating Buckhorn Rki> Ci «>\ ii; \.\ii Aii \ i i \ Seeds. Introduction 5 The mucilaginous propertj "i" buckborn seeds 6 Coating buckhorn seeds after moistening them fi The drj sawdust method of separation 7 Sieves o i 8 Alfalfa or red clo\ er seeds in two grades 9 The kind of sawdust \-< use Hi Drj Band or road-dust method I" Wet Sawdust lneth.nl II An alternative method II \\ . t sand method II Agglutinative method 11 Method i ■ separation not injurious to clover and alfalfa -ceils 12 Circular No. 3 - Stem Tumors or Knots on Vpple and Quince Trees. Occuri f tumors ■"> Description 6 Kxpeli lit- 9 Structure of tumors 10 lie I itinii of the tumors to other forms of disease II Effect of the disease upon trees 1 -' grstions to nurserymen, nursery inspectors, and orchardists. I"> Reports desired on the distribution and severity "!' stem tumors »r kn Hi Ml IV CIRCULARS OF THE BUREAU OF PLANT INDUSTRY. Circular No. 4. — Tun Treatment op Damping-Off in* Coniferods Seedlings. Introduction Procedure in experiments Powders used Sulphur Dry Bordeaux mixture Copper sulphate and lime Solution!- used Potassium sulphid and permanganate Formalin Sulphuric acid Circular No. 5. — Barley Culture in the Northern Great Plains. Development of the industry Distinct barley districts Comparison of yields of different varieties in the northern Great Plains area Two-rowed compared with six-rowed barley Breeding better strains Maintaining pure seed Cultivation I fees of barley Circular No. 6. — The Cultivation and Handling of Goldenseal. Introduction Habitat and range of goldenseal Description of the plant Description of the rhizome, or rootstock Collection and preparation of the root Brief medical history Cultivation Necessary soil conditions Fertilizers Artificial shade Use of i rees as shade Attention required Method- of propagation Experiments with seeds Experiments with divided rhizomes Experiments with plants from fibrous roots Yield of roots Time necessary to mature the crop Hydrastin content of cultivated roots Market conditions Highest and lowest prices Ciri i i.\r No. 7. — The Field Treatment of Tobacco Root-Rot. Nature of root-rot Field treatment of root-rol Occurrence of root -rot I ield experiments show iiiL r the bad effects of alkaline commercial fertiliz- ers on root-rot soils ( rreenhouse experiments \\ ith alkaline fertilizers Summary Page. 5 6 6 6 6 6 o 5 6 9 10 10 11 12 o 6 6 it 10 10 11 11 12 12 13 13 13 13 15 16 16 17 17 18 18 CONTENTS. ( 'iuti \n No. 8 The Smi ra of Soroih m. [ntroduction • , Kin _" 1 1 1 m i .- 1 1 1 n I s i i rain, or kernel, mi nit 6 Treatment of grain smut 6 formalin treatment 6 Hot-water treatment "> Copper sulphate treatment v Head smut s Recommendations s Circular No. 9 Texas Rooi Ro Field Experiments in 1907. [ntroduction :! Cause of root rot 3 Reproduction and distribution of the fungus 3 VIethods ol control ' Rotation of crops 4 deration of the soil by deep fall plowing 5 Summary ' Conclusions ~ Circi'i. m: No. 1". Notes on \>u\ Farming. 1 Iry-land agriculture in Mi 'in. ma 1 Plowing with gas iline traction engines - Dry-land agriculture in Utah ; 5 Drj -land agriculture in Colorado • Circular No. 11. Danger in Judging Cotton Varieties by Lini Percent- ages. [ntroduction 3 Smaller or lighter seeds raise lint percentage 5 Ld vantage of large seeds and large seeded varieties 6 Advantages of heavy seeds 8 Higher lint percentages with diminished fertility s Largi yields without high percentages 9 I [igh quality with low percentages II True st tndard of yield in cotton 12 A lint index for judging varieties I- Conclusions 15 Cibcux u; No. L2. Hi:', -Land Grains. [ntroduction ; 1 liversity of crops necessary ; I o i ley ' I Oats I Spelt and emmer 5 grain si irghums Rye 6 Minor crops 7 Wheat the principal crop Che arid region 7 The great « heat groups s The hard spring- wheat group s The durum w heats iwing popularity of durum wheats 9 VI CIRCULARS OF THE BUREAU OF PLANT INDUSTRY. Page. Circular No. 12. — Dry-Land Grains — Continued. The great wheat groups — Continued. The hard winter or Crimean wheats 10 Intermountain wheats 11 Greater uniformity necessary 12 The Pacific wheats 12 Future improvement 13 Conclusions 14 Circular No. 13. — The Work of the San Antonio Experiment Farm in 1907. Introduction 3 Lines of work undertaken 4 Tillage experiments 4 Deep plowing and subsoiling 4 Early fall plowing 5 Manuring 5 The dust mulch 6 Winter tillage 7 Rotation of crops 7 Methods of preventing sterility in sorghum 9 Eradication of Johnson grass 9 Crops for forage and green manure 11 Crops raised for grain 13 Cultural experiments with cotton 13 Acclimatization of weevil-resisting types of cotton 14 Horticultural work 14 Conclusions 15 Circular No. 14. — Change of Vegetation on the South Texas Prairies. Circular No. 15. — The Fertilizing Value of Hairy Vetch for Connect- icut Tobacco Fields. Introduction ' 1 Adaptability of hairy vetch to tobacco fields 1 Importance of inoculating hairy vetch 2 Pot experiments with hairy vetch 2 Nitrogen furnished by hairy vetch turned under 3 Pot experiments with tobacco 4 Conclusions 5 Circular No. 16. —A New Basis for Barley Valuation and Improve- ment. Circular No. 17. — Index to Papers Relating to Plant-Industry Sub- jects in the Yearbooks of the United States Department of Agricul- ture. Explanati try statement 1 1 idc \ Circular No. 18. — Reappearance oi a Primitive Character in Cottou Hybrids. Introduction Primitive characters shown in reversion and recapitulation CONTENTS. \ II Circular No. 18. Reappearance of * Primitive Character in Cotton Hybrids Continued. Ri appearance of green fuzz in cotton hybrids Differences betwei □ firsl and second g( m rations 6 Expressi >t cl aracters in firsl and second generations 7 Expression of characters determined by adjustments 9 Significance of primitive characters in breeding 10 Summary 11 Circular No. L9.— The Deca^ oi Florida Oranges while in Transit and ON I III M \l:k I I [ntroduction 1 Extent "i loss from decay in Florida oranges 1 Cause of deca) in oranges 2 Injuries and long stems '.' Packing-hi iuse experiments 3 Shipping experiments and market tests 5 delusion 8 Cntcui ir No. 20. \ n I ti< M Resisi inci Mi i ii. m for i m Rapid Deti r- UINATION "I Mil MOISTUR] CONTENI 01 (jRAIN. [ntroduction 3 Description of the electrical resistance method for measuring the moisture contenl of grain 3 Relation of electrical resistance to temperature 4 The determination of the isture contenl of wheal at different tempera- tures 5 Apparatus for measuring electrical resistance ol grain 6 Summary - Ciri i i iR No. 21. - Farmers' Cooperative Demonstration Work in [ts Rei a- tion ro Rural I mpro\ ement. Introduction 3 The neci improved rural conditions in the Smith 3 Si me reforms needed in rural life 7 The remed) offered by the Farmers' Cooperative Demonstration Work.. < Irganization of this special work 9 Instruction of the farmer 9 Field -<•! I> lu Instruction confined to a few essential subjects 11 Special features of the work II I'. fleet of the work on the farmer 12 Rural improvement the natural result of this work 13 Improved rural conditions alread] established 14 Bettered conditions among the colored people Cir< i lar No. 22, Farm Mi ii s oi Applying Land I'i ister in \\ i ■ Oregon and Western Washington [ntroduction :; Kpon's land-plaster distributer 5 Olson's land-plaster distributer 9 End gati seeders 13 Summary 14 VIII CIRCULARS OF THE BUREAU OF PLANT INDUSTRY. Page. Circular No. 23. — Potato Diseases in San Joaquin County, California. Introduction :i Potato wilt 4 The cause of "potato-sick" lands 4 Description of the wilt 4 The dry-rot of the tubers 5 Relationship of potato will to similar diseases in other crops 5 Soil fertility not a factor affecting wilt 6 Manner of infection and spread 6 Remedial measures for wilt 6 Rotation of crops 7 Wilt-resistant varieties of potatoes 7 Sanitary measures 7 A healthy seed supply 7 Potato seal) 8 Losses from scab 8 Cause of scab s Preventive measures for seal) 9 Seed treatment for scab. 10 Cost of seed treatment 11 Decay of potatoes 11 Cause of the " leak " 11 Remedial measures for the ' ' leak " 11 Rotation problems 12 Forage crops 12 Small grains for hay 13 Rye-grass 13 Vetches 13 Alfalfa 14 Other forage crops 14 Circular No. 24. — Alfalfa in Cultivated Rows fob Seed Production in Semiarid Regions. Introduction 3 Principles underlying alfalfa seed product ion 5 The relation of insects to the setting of alfalfa seed 8 Areas to which the growing of alfalfa for seed in cultivated rows is adapted. 10 Selection of soil 11 Location of fields 11 Preparation of the seed bed 12 The prevention of the drifting of soil 13 Choice of seed for cultivation in rows 14 Met hod of seeding in rows 14 Rate of seeding and thickness of stand 15 Seeding in check rows to permit cross-cultivation 16 Time of seeding 17 Treatment of the stand the first season .' 17 Treatment of the stand after the first season 18 The right crop to leave for seed IS Harvesting the seed crop 19 Possibilities of ^rvi\ production in cultivated rows 20 Developing valuable strain.- for seed production 22 Conclusion -'."> ( ONI I NT-. IX Page. Oibcolab No 25 ["he Cost of Clearing Logged-Ofj Land for Farming in i in: Pacifn Nori bwest. [ntroduction The extent of logged-off land 4 Hand method of clearing logged-off land 6 I tonkey-engine method of clearing logged-off land Methods ol bui ning stumps 10 l Be of chemicals in burning stumps 12 \ -i nni | id mini nir machine 1- l se "i powder in clearing logged-off land 13 i 08l of various methods of clearing land 14 Circular No 26. Somi Factors Effecting the Keeping Qualities of Amer- !( AN I.I M Scoiif of the invest i-aii. m of the keeping qualities of le is Losses "i lemons from parasitic diseases I osses of lemons from blue mold 4 Physiological weakness of lemons 4 M'tled- of preparing lemons for market 5 Physical characteristics of the differenl types of lemons Conclusion 17 Circular No. 27. — Lime-Sulphur Mixtures tor thi Summer Spraying oi • >R< II \i;Hs. Introduction '■'• Lime-sulphur sprays 4 Home-boiled lime-sulphur wash 4 Factory -boiled or commercial lime-sulphur solution 4 Self-boiled lime-sulphur mixture 5 Peach foliage injury test 7 Peach scab and brown-rot experiments Experiment in < i& irgia Experimenl in Illinois Experiment in Arkansas II Fruit staining 11 Recommendations for the treatment of scab and brown-rot 11 Cherrj leaf-spot experiments 12 Results of the treatment 13 Apple-scab experiments 15 Circular No 28 Clover-Sees Pr noN in hie Willamette Valley, ' >RBGON. [ntroduction Types of soils in the Willamette Valley 4 l he seed yield of red clover CIRCULARS OF THE BUREAU OF PLANT INDUSTRY. Page. Circular No. 28. — Clover-Seed Production in the Willamette Valley, • Ikegon— Continued. Means of securing a stand of red clover 5 Crop rotations practiced by growers of clover . 7 Pasturing and clipping clover 8 The use of land plaster in growing clover 9 Harvesting clover for seed 10 Treating clover seed affected with honey dew 12 Insect pests of red clover 12 How clover-seed production and live stock improve the soil 12 Summary 14 Circular No. 29. — Experiments with Egyptian Cotton in 1908. Introduction ."> Imports and prices of Egyptian cotton in 1908 5 Spinning tests of 1907 fiber 6 Results of exp' riments in 1908 7 Experimental fields at Yuma and Sacaton, Ariz 7 Comparison of imported and acclimatized seed 8 Different behavior of the different plantings 9 Yields 9 Quality of the fiber 11 I 'hint- breeding work 12 Planting distance 14 Irrigation methods 14 Productiveness in relation to time of planting and rate of irrigation.. 14 Crossing with other varieties 15 Diseases and insect enemies 16 Alkali resistance 18 Present outlook for Egyptian cotton in the Southwestern States 18 Summary 20 Circular No. 30. — Improvement of the Oat Crop. Need for improvement 3 Lines along which improvement can be effected 4 Methods of improvement 4 Mechanical selection 4 Introduction of new seed 4 Use of the seed plat 5 Individual plant selection (i Hybridization 10 Varieties 10 Conclusions 10 Circular No. 31. — Notes on the Number \m> Distribi tionof Native Legi mes in Nebraska and Kansas. Introduction ■"> Nitrogen fixation in soil by wild legumes 3 Difficulty of making investigation '■'> Legumes form a huge part of our native Horn t> Nodules abundant in wild legumes (> Factors influencing the distribution of wild legumes 7 Legumes are crowded out on the richest soils 7 Number of genera ami species in different localities 7 Value of legumes in pastures 8 Lesson of the prairie legume for the farmer 8 I 0NTENT8. XI Page. ClRI i I \K No. 32. MOISTI RE I 'ONTl \l INI) SHRINK \oi: l\ GRAIN. Wild legumes in the eastern United States 9 Introduction :> I — ol material in handling Reduction ol moisture and shrinkage 4 Whj the reduction of moisture and the shrinkage in grain are not the same * I low the difference between the reluct ion of moisture and the shrink- age in grain ran be determined 5 Explanation of tallies 7 CIRCULAR No. 33. I'm NECESSITY FOR NEW STANDARDS OF HOP VALUATION. introduction .'! Presenl methods of valuation 4 Deficiencies of existing methods 5 Necessity for new standards s Movement tor an international standard 10 Circular No. 34. The Work of mi: San Antonio Experiment Farm in L908. Introduction :! The climate of San Antonio, Tex 4 - il conditions of the region 7 The San Antonio Experiment Farm s Equipment 8 Lines of work undertaken 9 Experiments with cereals 10 Experiments with corn 11 Experiments with forage crops 12 Mexican seedling peaches It Tillage experiments 15 The < radication of Johnson grass 1<> Summary 17 Circular No. 35. The Preseni Status oi mi White-Pine Blights. Introduction :{ History of the different forms of blight 4 Complex nature of the diseased condition 4 Leaf-blight 5 Description of leaf-blighl 5 Distributi i leaf-blight 6 Possible causes of leaf-blight l> Results of investigations of leaf-blight 8 Tw ig-blighl 9 Tw ig-blighl caused by \\ interkilling 9 Tw ig-blighl caused bj insects 9 Twig-blight caused bj Lophoderminm brachysporum It) Sensitive nature of the white pine 10 Death ol white-pine trees from other causes than blight 10 Competition 10 insects 11 Root-rol 11 Lightning 11 Caution 11 Conclusions 11 XII CIRCULARS OF THE BUREAU OF PLANT INDUSTRY. rage. Circulai: No. ■'>«. — The Bud-Rot of the Coconut Palm. Prevalence of bud-rot in tropical America 3 Comparison of bud-rot with various coconut diseases 3 Desirability of a comparison of diseased material from the eastern and western tropics 4 Necessity for further knowledge of the disease 4 Cieculae No. 37. — Comparative Tests of Sugar-Beet Varieties. Introduction 3 Importance of comparative tests of sugar-beet varieties 3 Methods of conducting the tests 4 Methods of seeming the seed used 5 Varieties of seed used and growers producing them 5 Results of the tests 6 Circular No. 38. — European Currant Rust on the White Pixe in America. Introduction 1 Life history of the fungus 2 Field characters of the disease 3 Damage caused by the rust 3 Methods of combating the rust 3 Caution 4 Circular No. 39. — The Decay of Cabbage in Storage: Its Cause and Prevention. Introduction :'. Factors contributing to decay 4 Field infections 4 House infection 4 Careless handling 5 Organisms concerned in decay 5 Black-rot ■"> Soft-rot 6 Leaf-blight 6 Storage conditions necessary for preventing decay 6' Construction of storage houses to prevent decay 7 Methods of storing cabbage 8 Conclusions 8 Circular No. 40. — A Simple Method of Detecting Sulphured Babley and Oats. Introduction '■'< Method of bleaching used 3 The chemicals necessary for detecting sulphured grain 4 Method of testing grain 5 Necessity for cleanliness 6 Tests of natural barley in comparison with sulphured barley 7 ILLUSTRATIONS. TEX I in,l RES. Page. Circular No. I. Self-Boiled Lime-Sulphur Mixture is a Promising I I M.n [DE. 1. Crop of apples from a Ben Davie tree sprayed three times with self-boiled lime-sulphur mixture 10 2. Crop fr an untreated Ben Davis tree in the same orchard as thai shown in figure 1 II ClRCl I ,AR \". 2. An [mPROVI D Mi PHOD OF SEPARATING BUCKHORN FROM RED Clover ind Alfalfa Seeds. Fig. 1. Typical plant of buckhorn (Plantago lanceolate, L.) 5 2. Seeds of alfalfa a ; seeds of buckhorn ( 6) 6 3. Alfalfa seeds lit); normal buckhorn seeds ill): immature or ab- normal buckhorn 7 I. Buckhorn seeds coated with a grade of sawdust too coarse to ] through a No. 22 mesh (a); similar seeds coated with sawdust passed through a No. 22 mesh and from which very fine parti- cles have been screened out b); similar seeds coated with ver) fine sawdust c ; similar seeds coated with white sand (d) 8 •">. Perforated sheet zinc foi sieve to separate average grade oi red clover and alfalfa seeds. Holes one-fifteenth inch 8 6. Box screen designed bj the writer, with interchangeable sliding frames for various sizes of mesh. Suggested for the use ot the farmer who may raise but a lew s res of clover or alfalfa 9 7. The same screen e-hown in figure 6 with the frame withdrawn to show construction 9 s. Mixed sawd ust passed through a No. 22 mesh (a); sawdust of same de .i~ a but with fine particles ■ < I sifted out through a No mesh b thegrad* which should be used ; fine sawdust sifted from 6; too fine sawdust (c) 10 '.'. Fescuecha eeds coated with chaff (b) 11 10. Small seed balls, each being a buckhorn seed to which alia cling 12 Circular No. 3. Some Stem Tumors or Knots on ^pple and Quinci I Fig. i Stem tumors on an old apple tree at Mesilla Park, N. Mex 6 -'. Stem tumors on a Meech quince tree at Chico, Cal 7 3 Voung tu re forming at the base of t\\ igs "ii a Charlamoff apple tree at Fayetteville, Ark 4. Older tumors than those shown in figure :'> on a Charlamoff apple tree at Fa\ et ti \ ille, \rk 9 5. Roots produced from a tumor on a cutting taken from a Charlami apple tree and kept in moist soil 10 ti. Roots produced from tumors on a cutting taken fr a Meech quince tree near Chico, Cal 10 Mil XIV CIRCULARS OF THE BUREAU OF PLANT INDUSTRY. Page. Circular No. 3. — Some Stem Tumors or Knots on Apple and Quince Trees — Continued. Fig. 7. Longitudinal section of a tumor on an apple limb after throwing out roots when placed in soil 11 8. Longitudinal section of woolly-knot on a root-grafted apple tree grown from apparently healthy scion and root 11 9. The woolly-knot form of hairy-root on a Northern Spy apple tree grown in an experiment 12 10. The simple form of hairy-root on an apple seedling grown in an experiment 13 11. The origin of hairy-root from Inn Is on an apple seedling 13 Circular No. 6. — The Cultivation and Handling of Goldenseal. Fig. 1. A flowering plant of goldenseal 7 2. A fruiting plant and a fruiting branch of goldenseal 8 3. Rhizome, or rootstock, of goldenseal 9 4. Rhizome, after division 14 5. Plant formed from bud on fibrous root of goldenseal 15 6. Seedlings of goldenseal 16 7. Goldenseal, showing bud on fibrous root 17 Circular No. 9. — Texas Root-Rot of Cotton: Field Experiments in 1907. Fig. 1. Experimental plats of cotton at Petty, Tex., showing the results of deep fall plowing (5 Circular No. 16. — A New Basis for Barley Valuation and Improvement. Fig. 1. High-grade Swedish pedigree barley 6 2. Low-grade barley sold on the Milwaukee market 7 3. Malted barley from Pilsen, Austria 8 Circular No. 19. — TnE Decay of Florida Oranges while in Transit and on the Market. Fig. 1. An interior view of a packing house in Florida, showing the large hopper used for delivering orange- to the sizing machine 6 2. Interior view of a packing house in California, showing the machinery used in preparing oranges for shipment 7 Circular No. 20.— An Electrical Resistance Method for the Rapid De- termination of the Moisture Content of Grain. Fig. 1. Chart showing the relation between the moisture content and the electrical resistance of wheat 4 2. Chart showing the influence of temperature upon the electrical resistance of wheat, a 3. Chart for determining the moisture content of wheat when the electrical resistance and temperature are known 7 Circular No. 22. — Farm Methods of Applying Land Plaster in Western Oregon and Western Washington. Fig. 1. Field showing the effect of land plaster on clover 5 2. An implement for distributing laud plaster devise. 1 by Mr. Clar- ence Kiiim, Lane County, Oreg 6 3. Cro-s section of the box of the land-plaster distributer shown in figure 2 6 4. The lever of the land-plaster distributer shown in figure 2 com- plete as it rests upon the board that sup] ports it s 5. The lever of the land-plaster distributer shown in figure 2 8 ILLUSTRATIONS. X\ I Circular No. 22. Farm Methods oi Vpplying Land Plaster in Western Oregon ind Western Washington Continued I to 6 An implement for distributing land plaster devised by Mr. Charles Olson, of Washington County, Oreg 9 7. Bottom view of Olson land-plaster distributer, showing the ho in the box through which the plaster passes and the attach- ment of the tongue and its braci - to the box 10 8. I tion of the box of the land-plaster distributer shown in figure 6 in •>. [nside view of the box of the land-plaster distributer illustrated in figure 6, showing the feed hole?, the square rod that revolves in the bottom of the l>.>\, and the position of the lever when used in slipping the upper sheel ol galvanized iron to open or close the feed holes L2 10. A. double-fan end-gate seeder attached to the hind wheels of a wagon 13 Circular No. 24 Alfalfa in < Iultiv ited Rows for Seed Produi noN in kRm Regions. Fig. 1. Heavily seeded isolated alfalfa plant grown near Washington, D. ('.. where the climatic conditions are much more unfavorable to the producti if alfalfa seed than in the semiarid sections. 7 l'. Alfalfa in cultivated rows for seed, Dear Stockton, Kans Hi 3. Mowing machine with dropper attachment in i iperatii m in a field of alfalfa in cultivated rows in western Nebraska 19 Circular No. 25, 'I'm Cosi oi Clearing Logged-Ofi Land for Farming IN Till I' vcific Nori II Fig. 1. Logged-off land cleared of stumps in winter and sowed to oats in spring A 2. stump pasture land 4 3. Pulling a -tump w ith a donkey engine 7 4. Elevation showing method ol setting donkej engine and gin pole in clearing land 7 ■">. Diagram showing position of donkey engine and rigging for clear- ing a 10-acre tract 8 (>. stumps piled around gin pole in clearing with donkey engine 9 7. Diagram showing method of preparing a stump for burning 10 8 Diagram showing method of charcoaling or pitting stumps 11 9. Box for keeping powder warm 14 Circular No. 27. — Lime-Sulphur Mixtures fob mi' Summer Spraying of < lR< II VRDS. Fig. l. (Jnsprayed Montmorency cherry tree defoliated by the cherry leaf-spot 14 2. Montmorency eheny tree sprayed with Belf-boiled lime-sulphur mixture for the control of leaf-spot, showing full foliage 1"> Circular No. 28. Clover-Seed Production in im- Willamette Valley, I |R1 GON. Fig. I. Field showing the effect of land plaster on clover '< l'. The side-deliver) I uncher ClRCULAH NO 30, -] MPR IVEMEN1 01 i ill OaI < 'll"l'. Fio. l. Diagram Bho wing the planting pla the improve- ment ol oats by individual plant selection XVI CIRCULARS OF THE BUREAU OF PLANT INDUSTRY. Page. Circular No. 34. — The Work of the San Antonio Experiment Farm in 1908. Fig. 1. Sketch showing the location of fields, crops, etc., on the San Antonio Experiment Farm !t •Circular No. 37. — Comparative Tests of Sugar-Beet Varieties. Fig. 1. Diagram showing the standing of sugar-beet varieties tested, at each station and at all stations 7 2. Diagram showing the standing of sugar-beet varieties tested, for each year and for all years 8 Circular No. 40. — A Simple Method of Detecting Sulphured Barley and Oats. Fig. 1. Chemicals and apparatus used for detecting sulphured grain 5 2. Eight bottles filled with solutions, showing the results of tests of sulphured commercial barley 7 3. Seven bottles filled with solutions, showing the results of tests of samples containing different percentages of sulphured barley and of samples of natural, or unsulphured, barley from the agricultural experiment stations of Nebraska, Wisconsin, and Kansas 8 UNIVERSITY OF FLORIDA o 3 1262 09218 1527