NEW JKHSEY AGRICn.TT^RAL COLLEGE 



Air. Du'lvcrsdii. Al that tillu^ tlio trw^s luul Ix-en serajied aud 

 tliitiiuHl bv trinuninji', but iw insin-ticide applications had vet heen 

 ina(h\ XmiuM-tnis hilKM-uatiiiij: sixvinicns had been observed under 

 the huK^t*. baik and others were, observed yet present in the crevices 

 \vh(M\>ver cxaniination was made. The owners were advised to 

 bnrn all triiuniiniis and scrapings and to apply j^etroleum in some 

 t'erni, dri\inii' tlu^ spray into the crevices with as niucli force as 

 possible. 



,]\\uo li^ih another exaniinati»ni was made, and it was found 

 that \\\o trees had been sprayed with a kerosene emulsion giving 

 about \0 per cent, of actual kerosene. Exami- 

 nation made soon after the application showed. 

 iluu the insects had been killed wherever the 

 mixture had reached them, but it was also found 

 that by no means all of them had l^een reached. 

 This was quite obvious also at the date fii*st 

 given, because specimens were found on lx)th 

 leaves and twig-s, though in no ereat niunbei-?. 

 It was also learned that the pest had spread into 

 other orchards and was obvious where none had 

 been observed in previous years. 



To i-each this insect in its winter quartei-s 

 is not altogether easy, for the adult crawls 

 deep into every crevice or gx^ts under eveiy bit 

 of available shelter, so that any ordinary spraying work will miss 

 reaching it. liough-barked trees should be scraped and trimineii 

 in winter, and all the hx^se material should W burned at once. 

 If it is allowed to reuuiiu for any length of time, the exposed 

 insects on it will move away and seek other shelter and so will 

 escape destruction, and the warmer the weather the sooner the 

 instvts will move, so that the leeway is gi-eater in cold weather 

 than in the warm simshine of many March days. Kerosene emul- 

 sion or soluble oil should be applied very thoroughly, especially on 

 the trunks aud larger branches, so that all slits, cracks or crevices 

 in the bark may W reached, aud the greater the force of the spray 

 the Knter the chance of a satisfactoiTr result. Ten per cent, of 

 actual oil will not l>e tvX) strong and will give better results than a 

 wvaker solution, and if the spraying can be done on a warm, sunny 

 day, just before the trees start, more insects will be reached than 

 otherwise, Ixxniuse the oil spreads and penetrates better on a 



IViXr ^v^yUrt : wing 

 adult : onlaryiHl. 



