THE BUD MOTH 



17 



Table 6. — Results of experiments in spraying apple twigs infested ivith the 

 bud moth and the lesser bud moth with powdered arsenate of lead at the 

 time the blossom buds were showing pink 



Treatment 



Number of larvae 



Healthy 



Sickly 



Dead 



Sprayed (23 twigs) : 



Bud moth 





 6 



6 

 9 



2 

 3 





 









2 



Check (17 twigs) : 







Lesser bud moth .. . 











It is quite possible that some larvae were killed by the spray, but 

 left the foliage before dying. 



On May 11, at the time of the calyx application, and some time 

 before any larvae had made preparations for pupation, a similar 

 experiment was carried out. The material was examined on May 

 18, and the results are noted in Table 7. 



Table 7. — Results of calyx application on apple twigs infested with the bud 



moth 



Treatment 



Number of Tarvse 



Healthy 



Sickly 



Dead 



Sprayed (19 twigs) .... _ 



6 



10 



5 







4 



Check (18 twigs). 











In both of these tests more larvae would undoubtedly have died if 

 more time had elapsed before the material was examined, but the 

 foliage was beginning to wilt, and the examination could not be fur- 

 ther delayed. The presence of dead larvae in the second test, however, 

 indicated that the arsenate of lead was being consumed and was 

 having its effects. 



During the same season a number of small apple trees of several 

 varieties in a near-by orchard were sprayed with arsenate of lead, 1 

 pound in 50 gallons, using a bucket pump. Each plat contained from 

 >9 to 12 trees. One plat received the pink application only, one the 

 calyx application only, and a third received both applications. Later 

 on, before any larvae had begun to pupate, all nests were removed 

 from four count trees in each plat, and the numbers of dead, sickly, 

 and healthy larvae were recorded. The results are given in Table 8. 



Table 



-Effect of arsenate of lead spray on small apple trees infested ivith 

 the bud moth 



Plat 



Treatment 



Nests 

 found 



Larvae found 



Healthy 



Sickly 



Dead 



I 



Pink and calvx . _ .. _ 



51 

 58 

 122 

 123 



3 

 11 



8 

 38 



2 

 1 

 4 

 





II 









III 



Calyx alone 



16 



IV 



Check 



1 







