76 THE KANSAS PEACH. 



the results of the attacks so marked as in the injury to the new growth 

 in April. 



Our records for the first summer brood indicate a period of about 

 six weeks as necessary for its complete development. The time nec- 

 essary in the warmer months for the later broods is probably even 

 less, and it is evident that there are certainly three broods of larv« 

 annually, if not four. One of the important j^oints remaining to be 

 cleared up in regard to this insect is whether the larv?e found in the 

 crotches of the branches in late summer and fall come from eggs 

 placed in these situations or are migrants from some other parts of 

 the plant. Mr. Ehrhorn's supposition that the eggs were placed by 

 the moth where the larval chambers are afterwards found are borne 

 out by the small size of the larvae, which are not much larger than 

 when newly hatched. The comparatively large size of the egg and 

 its striking appearance, and the lack of any attempt at concealment 

 of it, should enable one, where the insect is abundant, to clear up this 

 uncertain feature without difficulty. 



NATUEAL PARASITES. 



That the larv?e of the peach twig-borer are attacked by parasites 

 during the hibernating period has already been alluded to, and, in fact, 

 of the material received from Mr. Ehrhorn, nearly 

 all had been destroyed by a minute predaceous mite, 

 PccUculoides ventincosus. Fig. 17. In most in- 

 stances nothing remained of the larvte excej^t the 

 emi^ty heads. Two minute hymenoptera, or four- 

 winged fly parasites, have also been reared from the 

 larvte. The first of these was obtained by Prosessor 

 Comstock, who, in his studies of the peach twig- 

 borer, reared a i)arasite from it which he did not 

 name, but which was later described by Dr. L. O. 

 Howard as Copidosoma variegaUmi. The second 

 ^^vejuriMsus-much ^Y parasitc of Anarsia was obtained from the ma- 

 eniarged(originai). ^^^-^^ -^ ^^^^ crotches Submitted by Mr. Ehrhorn, 



and proves to be Oxymorpha lirida Ashmead, a wide-spread species, 

 quite variable in point of size. Of these parasites, in California the 

 greatest benefit is derived from the mite, which, as we have already 

 stated, frequently causes the death of from seventy-five to ninety-five 

 per cent, of the young larvse. 



REMEDIES AND PREVENTIVES. 



The common method of procedure against this insect, and the one 

 hitherto generally suggested, is to clip off and burn the withering in- 

 fested tijDS in the spring as soon as the injury is noted. The forego- 



