12 CIRCULAR 926, U. S. DEPARTMENT OF AGRICULTURE 



had reached marketable size and weighing the total crop from 

 each row separately. The germination, growth, and production 

 of spinach were not affected by three applications of any of the 

 insecticides (table 2). 



Tomatoes 



Tomato transplants of the Pearson variety were planted in the 

 plots on April 21, 1949, March 21, 1950, and April 10, 1951. Each 

 year 12, 10, and 8 plants were set out 5 feet apart in each plot. 

 Three or four pickings of the ripened fruit were made between 

 September 5 and October 2. The number and weight of the fruits 

 picked were recorded. 



In 1949 many of the plants became diseased and were removed 

 to prevent others from becoming affected. No difference could be 

 detected in the size of plants between the treated and untreated 

 plots. Furthermore, none of the treatments significantly affected 

 the yield or number of fruits picked. 



Of the 300 tomato plants set out in 1950, 100 were removed be- 

 cause they were diseased. The remaining plants in both treated 

 and untreated plots grew normally, and no differences in size or 

 appearance were noted. With fewer plants the plots treated with 

 ethylene dibromide had the lowest yield of tomatoes, but there was 

 no significant difference in yield between any of the treatments. 



None of the plants set out in 1951 were diseased or appeared to 

 have been affected by the treatments. The number and weight of 

 the fruit harvested in the various plots did not differ significantly 

 (table 3). 



Peppers 



Pepper transplants of the California Wonder variety were 

 planted in 30 feet of row per plot on May 19, 1949, April 14, 1950, 

 and May 3, 1951. Owing to a scarcity, only 6 were set out per plot 

 in 1949, and 10 each in 1950 and 1951. From 5 to 8 pickings of the 

 marketable pods were made each season. Weighings were made of 

 the entire lot of pods picked in each plot. 



Frequent observations failed to reveal any marked differences 

 in the size of the plants due to the insecticide applications. Fur- 

 thermore, the differences in yields and in numbers of pods picked 

 were not significant (table 3). 



Peas 



Laxton Progress peas were planted on April 15, 1949. and the 

 Wyola variety on March 8, 1951. They were seeded in single rows 

 60 feet long. The yield of peas was determined by picking all the 

 pods in each row as they matured, on two or three occasions, and 

 weighing each lot separately. On completion of the final picking. 

 the vines in each row were cut at ground level and weighed. None 

 of the differences in yield were significant (table 4). 



