ANNUAL REPORT, 1936 27 



Burgundy (12 H percent) 2-3-50; Bordeaux (25 percent) 4-4-50; Copper Hydro 

 "40" (26 percent) 4-50; K K Copper Compound (25 percent, a copper oxy- 

 chloride preparation, 4-50; Oxo-Bordeaux (12 J^ percent) 8-50; Coposil (18 

 percent) 3-50; Sherwin-Williams Basi-Cop (.52 percent) 2-50; and Wettable 

 Sulfur 4-50. Sprays were applied with a wheelbarrow sprayer. 



Absence of fungous diseases rendered comparison of fungicidal values im- 

 possible. Slight burning of the foliage was caused by Bordeaux and severe 

 burning by Burgundy. The most significant feature of the test was a striking 

 reduction in yield resulting from use of these two sprays. 



3. Eggplant Wilt (Verticillium). It has been established that treating egg- 

 plant seed in hot water at 120°-125° F. for 30 minutes kills the wilt fungus 

 without reducing the viability of the seed. Plants grown from seed so treated 

 were distributed to six farms in Massachusetts. Examination of these plantings 

 on August 25 showed infection ranging from 50 to 100 percent on five farms, 

 and 2.15 percent on one farm. 



These observations support the view that the causal fungus is present rather 

 generally in the soil. This fact renders the hot-water seed treatment of no 

 apparent value; hence, there seems no justification for recommending its use. 

 In the one instance where the seed was grown on abandoned sod, the planting 

 was practically free of wilt. Apparently benefit from seed treatment can be 

 expected only in cases where eggplant is to be grown on fresh or abandoned sod 

 land and the fungus is virtually absent or inhibited by unfavorable soil re- 

 action. 



4. Spraying Greenhouse Cucumbers for Control of Powdery Mildew. Cu- 

 cumbers were sprayed in two greenhouses with the following fungicides: 

 Bordeaux 1-1-50, Bordow 2-50, Corona Copper Carbonate (50 percent) 1-50, 

 Corona Copper Carbonate (18 percent) 2-50 and 3-50, Hammond's Copper 

 Solution 1-150 and 1-200, Mike-Sulfur 2-50, Potassium Sulfide 1-50, and 

 Sherwin-Williams Basi-Cop (52 percent) 1-50. To each 50 gallons of spray 

 was added Yi pint of Penetrol. 



All of the treatments controlled powdery mildew. None caused sufficient 

 stain on the cucumbers to be objectionable. 



Sulfur provided slightly longer protection than copper, but in all cases the 

 renewal of the sprays within 10 days was necessary to maintain control. 



5. Trials of So-Called Rust-Resistant Beans. Fifteen bean hybrids selected 

 for resistance to rust were obtained from the Virginia Experiment Station and 

 two from the United States Department of Agriculture. These were grown to 

 observe plant characters and reaction to bean rust caused by Uromyces phaseoli 

 (Pers.) Wint. var. typica Arth. 



Eleven of the strains from Virginia were found to be very susceptible to rust. 

 Four hybrids, 32-C-3, 32-C-4-2, 14-A-32-1935, and 5-A-32-S-33 were only 

 slightly susceptible. None yielded beans. The two strains obtained from the 

 United States Department of Agriculture were found to rust heavily and 

 yielded moderately. None of the strains tested was found to be sufficiently 

 resistant or productive to warrant recommendation here. 



Carnation Blight, Alternaria Dianthi S. & H. (E. F. Guba, Waltham.) 

 Two field tests to demonstrate the control of this disease according to the 

 author's recommendations proved highly gratifying to members of the New 

 England Carnation Growers Association and other carnation growers. 



A mixture of Bordeaux 5-5-50, calcium arsenate 1 lb., and Penetrol (spreader) 

 Y 2 pint, was employed as the fungicide. As a severe test of the fungicide, the 

 plots were protected throughout the outdoor growing season beginning with 



