APPENDIX. 393 



attack the rapidly growinj^- shoots, enteriDg them either at the tip or in the 

 axil of a leaf, and boring- in the pith as shown in Fig. 5, Plate VII. As soon 

 as the fruit begins to develop, it is also attacked, the larvae usually boring 

 directly to the pit, ujion which they seem to prefer to feed. ( See Fig. 4, 

 Piute VII). 



OTHEK GENERATIONS. 



During the summer we shall attempt to determine where the moths 

 deposit their eggs, how many generations of larva? thei-e are, and how they 

 feed. It is probable, however, that the one or more summer broods of 

 larvae feed upon the leaves of the prune, and that unless very numei"OUs they 

 do but little injury. As fall approaches, the half-grown larva' probably 

 retreat upon the branches, where they burrow into the bark and pass the 

 winter, ready to emerge and attack the young shoots as soon as they begin 

 to develop in spring. 



REMEDIES. 



It is possible that a winter-spraying with strong kerosene emulsion, or 

 lime, salt, and sulphur wash would prove effective in destroying the half- 

 grown larvae in their winter quarters ; but since they must be exceedingly 

 well protected in their burrows, we are strongly of the opinion that the best 

 and cheapest remedy is to spray the trees just when the leaf buds are 

 unfolding with paris green, so that the larva's first meal in the spring will 

 be a poisonous one. The best results will be obtained by applying the 

 poison in bordeaux mixture, using one pound to each two hundred gallons. 

 It is also possible that a more complete knowledge of its liie-history will 

 show that this insect may be successfully controlled by spraying at other 

 times. 



BLACK APHIS OF THE PEACH. 



( Aph is persica-niger, Smi th . ) 



By Pkof. Alexander Ckaw. 



The danger of importing eastern nursei-y stock is not altogether confined 

 to the Yellows or borers, but the black peach aphis is to be dreaded upon 

 the peach as much as the woolly aphis upon the apple. Doctor Smith, who 

 described this insect, says : 



" In Deleware, Maryland, and parts of New Jersey and Virginia this aphis 

 was reported everywhere to be unusually prevalent and destructive. In 

 April, when the leaf buds were pushing, I saw them cluster upon so many 

 shoot axes and so compactly as to kill young trees, and even very consider- 

 able branches upon older trees. They were especially destructive to nursery 

 trees and to orchards just planted. I saw one nursery in which at least one 



