82 



BULLETIN 932, U. S. DEPARTMENT OF AGRICULTURE. 



emerged from the larvae collected from the banded trees at both the 

 Edwards and Hamilton orchards. The first moth emerged June 25, 

 the last September 8, a period of about two and a half months. The 

 highest number of moths that issued in one day from this combined 

 material was 167 on July 28, and this day was almost midway be- 

 tween the date of the first and last emergence. It will be recalled 

 that, according to the insectary bred material, there was an over- 

 lapping of the first and second brood moths from August 7 to Au- 

 gust 19 and that August 13 was theoretically considered as the divid- 

 ing line between the two broods. 



Table LVTI.— Band-record experiment, codling moth larvce collected at the Ham- 

 ilton orchard, Grand Junction, Colo., 1916. 









Total 



Per cent of— 









Total 



Per cent of — 



Date of 

 collec- 

 tion, 

 1916. 



Collec- 



Num- 

 ber of 



num- 

 ber of 







Date of 

 collec- 

 tion, 

 1916. 



Collec- 



Num- 

 ber of 



num- 

 ber of 













tion 



larvae 



moths 



Moths 



Indi- 



tion 



larvae 



moths 



Moths 



Indi- 



No. 



col- 



emerg- 



emerg- 



viduals 



No. 



col- 



emerg- 



emerg- 



viduals 





lected 



ing, 



ing, 



winter- 





lected. 



ing, 



ing, 



winter- 









1916. 



1916. 



ing. 









1916. 



1916. 



ing. 



June 17 



1 



19 



13 



68.42 



31.58 



Aug.28 



25 



225 







0.00 



100. 00 



20 



2 



27 



20 



74.07 



25.93 



31 



26 



206 







0.00 



100. 00 



23 



3 



32 



20 



62.50 



37.50 



Sept. 3 



27 



149 







0.00 



100.00 



26 



4 



96 



53 



55.20 



44.80 



6 



28 



169 







0.00 



100. 00 



29 



5 



88 



81 



92.04 



7.96 



9 



29 



129 







0.00 



100. 00 



July 2 



6 



95 



79 



83.15 



16.85 



12 



30 



76 







0.00 



100.00 



5 



7 



119 



77 



64.70 



35. 30 



15 



31 



72 







0.00 



100. 00 



8 



8 



121 



100 



82.64 



17.36 



18 



32 



106 







0.00 



100. 00 



11 



9 



125 



91 



72.80 



27.20 



21 



33 



123 







0.00 



100. 00 



14 



10 



165 



154 



93.33 



6.67 



24 



34 



99 







0.00 



100.00 



17 



11 



173 



134 



77.45 



22.55 



27 



35 



105 







0.00 



100.00 



20 



12 



204 



153 



75.00 



25.00 



30 



36 



78 







0.00 



100. 00 



23 



13 



272 



201 



73.89 



26.11 



Oct. 3 



37 



56 







0.00 



100. 00 



26 



14 



246 



194 



78.86 



21.14 



6 



38 



37 







0.00 



100. 00 



29 



15 



175 



122 



69.71 



30.29 



9 



39 



41 







0.00 



100. 00 



Aug. 1 



16 



217 



128 



58. 98 



41.02 



12 



40 



22 







0.00 



100. 00 



4 



17 



262 



106 



40.45 



59.55 



15 



41 



44 







0.00 



100. 00 



7 



18 



264 



94 



35.60 



64.40 



18 



42 



27 







0.00 



100. 00 



10 



19 



258 



63 



24.41 



75.59 



21 



43 



6 







0.00 



100.00 



13 



20 



202 



21 



10.39 



89.61 



24 



44 



6 







0.00 



100.00 



16 



21 



164 



8 



4.87 



95.13 



27 



45 



7 







0.00 



100. 00 



19 



22 



209 



6 



2.87 



97.13 



30 



46 



5 







0.00 



100.00 



22 

 25 



23 



24 



U88 

 207 



1 







2 0.54 

 0.00 



2 99. 46 

 100.00 

















Total.. 



5,716 



1,919 



2 33.60 



2 66. 40 



1 5 larvae killed in handling. 2 All percentages based upon number of live larvae collected. 

 NATURAL ENEMIES OF THE CODLING MOTH. 



PREDACIOUS ENEMIES. 



The codling moth in the Grand Valley is seldom attacked by 

 predacious insects and, as a result, the reduction of the pest by this 

 means is quite inconsequential. A small beetle, Tenebroides corti- 

 calis Melsh., which, in its larval and adult stages, is known to feed 

 upon the codling moth larva, was occasionally taken from beneath 

 the bands on apple trees. A spider, Coriarachne versicolor Keys., 

 was found from time to time feeding upon larvae of the codling moth. 

 This spider is a general feeder and is commonly found beneath the 

 loose bark of orchard and shade trees. 



In view of the comparative absence of predacious insect enemies 

 an attempt was made to introduce the well-known beetle Calosoma 



