315 



with relation to the date of planting and period of silking, has been 

 made during the past six years. This work represents the daily 

 number of eggs deposited on 128 individual plants and the silking 

 period of 128 rows of maize. Three distinct broods of the corn earworm 

 occur each year, the first brood of moths emerging early in June, the 

 second brood about 10th July, and the third brood about 10th August. 

 The maximum emergence occurs about two weeks after the first 

 emergence. The first two broods are of little importance in comparison 

 with the third. The date of silking is dependent on the variety rather 

 than on the date of })lanting. While the plantings were made at 

 intervals of two weeks the dates of silking show a difference of less 

 than a week for maize planted 15th April, 1st May and 15th May. 



The moths show a decided preference for the silks for oviposition. 

 When these are not available, the upper surface of the leaves and the 

 stalks are selected. Relatively few eggs are deposited on the lower 

 surface of the leaves, the husk, or the tassel. There is a distinct 

 relation between the date of planting and the number and location 

 of the eggs. From the data presented, the loth April is too early to 

 plant maize from the standpoint of oviposition, and the 1st June is too 

 late. The variety of maize, however, is to be considered in developing 

 variations which will have an influence on the number of eggs deposited 

 on it. An analysis of the data indicates that from the standpoint of 

 the number of eggs deposited, Boone County White can be planted 

 from 15th April to 1st May, Commercial White about 1st May, and 

 Kansas Sunflower and Hildreth from 1st May to 15th May. Consider- 

 ing the results for the lour varieties, 1st May, under favourable 

 conditions, is the optimum time to plant maize to escape the corn 

 earworm. 



Considerable variation has been noted in the number of eggs deposited 

 on the four varieties of maize. In -IS" 7 per cent, of the plots grown in 

 the six years, Boone County White had the lowest number of eggs. 

 Kansas Sunflower had the fewest eggs in 28" 3 per cent, of the plots. 

 Commercial White in IS'G per cent., and Hildreth in 12*5 per cent. A 

 similar variation was notecl in the location of the eggs on the different 

 varieties. There are a number of factors to be considered with relation 

 to oviposition on varieties of maize, the principal ones being the time 

 and period of silking, the time of m.aturing, and certain morphological 

 characters of the plant. 



Resolutions adopted by the Cotton States' Entomologists at Vicksburg, 

 Miss., March 1, 2 and 3, 1920. — Jl. Econ. Entom., Concord, N.H., 

 xiii, no. 2, April 1920, p. 257. 



Among the resolutions adopted were the following : — That it is the 

 conviction of the members of this Association that the European corn 

 horev[Ptfrausta nnhilalis], Japanese beetle [Popillia japonico], Oriental 

 peach moth [Cydia molesta] and gipsy moth [Porthetria dispar], foreign 

 pests established in the north-eastern United States, constitute a 

 potential menace to the agricultural prosperity of the Southern States, 

 and we urge upon the National Government such steps and appro- 

 priations as are necessary to prevent the further spread of these 

 destructive pests in the United States, and that earnest efforts should 

 be made to eradicate them. 



