THE MONTHLY BULLETIN. 



Rows of trees as num- 

 bered in plots 



LA Hi 2A 2B 3A 3B 4A 4B BA 5B 6A 6B 



Per cent of fruit sliowing 

 no insect injury 



Per cent of fruit showing 

 injuries caused by Col- 

 eophora volckri 



Per cent of fruit showing 

 injuries caused by fruit 

 leaf roller 



Per cent of fruit showing 

 Injuries caused by cater- 

 pillars, such as Tussock 

 caterpillar 



Per cent of fruit showing 

 injury caused by the 

 codling moth 



Per cent of fruit sliowing 

 injuries caused by in 

 s--«ts not listed above. 



Per cent of foliage show- 

 ing injury by Coleo 

 plioru volckei — 



Produced by small larva 



Produced by adult larva? 



467 

 Check plots. 

 7A 7B SA B14 



Total 



Rows receiving defoliating 

 sprays 



Rows receiving standard 

 winter sprays 



First spring spraying 



Second spring spraying 



So S7 93 85 87 94 9S 93 92 SS 92 91 72 79 85 8S 



2 2 3 2 3 3 3 1 1 18 17 U 6 

 981932125482323 S 



3 2 2 a 4 1 1 1 3 1 5 3 2 3 8 



l 1 1 1 1 fl 2 1 1 1 



100 2 0002120201 



7 5 2 7 3 8 2 11 12 22 12 

 3 2 3 3 2 13 



10 7 2 Id li 10 2 9 11 13 25 12 

 YoYOXOXOoOOO 



10 13 



30 25 25 '.' 



:S7 25 23 12 







xvovovvvvvvvvvv V 



ZZZZZZZZZZZZBBB B 

 ZZZZZZZZZZZZBBB B 



X = Lime sulfur. V = Crude oil emulsion. O = Unsprayed. Z 

 sulfur. B = Lead arsenate anil mill=d sulfur. 



= Nicotine sulfate and milled 



Referring to the 

 table it is seen that 

 the A sections of 

 the plots are not 

 materially different 

 from the B sec- 

 tions ; h o w eve r, 

 there may have 

 been a slight 

 advantage from the 

 defoliating spr a y 

 applications, since 

 the natural abund- 

 ance of G. volekei 

 decreases Inwards 

 row B 14. In fact. 

 the corner repre- 

 sented bv rows 1, 

 ■2, 3, 4, 5, C, A was 

 the most heavily- 

 infested portion of 

 the orchard. 



In comparing the 

 sprayed rows with 

 checks the results 

 obtained from the 

 foliage are as inter- 

 esting as the fruit 

 counts. Here it is 

 seen that the rela- 

 ... tion between the 



Characteristic injury to apple by 0. volcKei number of mines 



(Original). produced by small 



and bv adult larva? changes abruptly between the check and sprayed rows. 



It appears from a general survey of the results that nicotine sulfate is capable ot 

 a rery marked control of Coleophora volekei, but that Hie control of the codling moth 

 and the fruit tree leaf roller is doubtful or not so g I as with arsemcaie. 



Fig. No. 14 4. 



