April, 'lOj PARROTT : CHERRY ERMINE MOTH 157 



cold weather which no doubt accounts for its relatively slow growth. 

 In plots No. 3, No. -4, No. 5 and No. 6 the damage is progressively 

 greater as silking comes more and more completely into the time when 

 the third brood is active. 



The reason, then, that earlj- planted corn experiences less injury 

 than corn planted later lies in the fact that early planted corn passes 

 through its most attractive stage — silking time — before the third 

 and by far the largest brood has appeared, or at least before it has 

 a chance to do its full work. The experiment further shows that 

 corn planted so early as to get a "set-back" suffers more from this 

 insect than if it were planted just a little later. Clearly the optimum 

 time for planting is just as early as the corn can be put in the ground 

 and escape injury from cold weather. 



In summing up the practical results of this study, it may be said 

 that the individual corn grower by planting his crop on uninfested 

 or cleaned soil as early as the season will permit may reasonably 

 expect to escape forty per cent of the injury he would otherwise 

 experience. 



President Brittox : The next paper Avill be read by Mr. George 

 G. Ainslie, Clemson College, S. C. 



NOTES ON APHIS MADIRADICIS 



By G. G. AixsLiE, Clemson College 

 [Withdrawn for publication elsewhere.] 



President Britton : Mr. P. J. Parrott will now present his paper 

 on the Ermine Moths. 



THE CHERRY ERMINE MOTH 



{Hyponomeuta padella L.) 



By P. J. Pakeott, Geneva. N. Y. 



During June, 1909, several cherry seedlings, completely covered 

 with silken webs, were brought to the Entomological Department 

 for examination by Mr. John ]\Ianey of the Division of Nursery 

 Inspection. The unfamiliar appearance of the nests and the enclosed 

 caterpillars, coupled with the fact that the specimens were taken from 



