March. 1921. 



SCIENTIFIC AGRICULTURE 



11' 



brown ; basal joint of antenna dark brown, apical joint 

 pale brown ; mouth parts pale yellow : aeeUi pale yel- 

 low on a dark brown area, the three ventral ocelli 

 forming: an equilateral triang-le : ch*peus pale yellow : 

 labnuu dark brown. Thoracic shield about concolorous 

 with head, slightly paler <>n the anterior margin. 

 Thoracic leg^ very dai-k lirown. Anal plate pale i-ed- 

 dish-yellow. slightly i)aler than the remainder of the 

 dorsum. Tubercles inconspicuous. Seta eta frequently 

 not contained on the same pinaculum as kappa en 

 prothorax. Setae kappa, eta and mu on the 9tjii ab- 

 dominal are separated and not nece.s.sarily contained 

 on the same pinaculum. 



The larvae of the species of Plodia, which has been 

 determined as interpunctella, have been received on 

 man}- occasions in mistake for the larvae of the Codling 

 Moth. They have been taken frequently under burlai) 

 bands on apple trees in Codling Moth quarantined areas, 

 occasionally in apple fruit on the trees, but most com- 

 monly in dry cull apples left as refuse in the orchard 

 out-of-doors and in the packing house. Specimens have 

 been received from all parts of the Okanagau valley 

 and their size and colour may easily cause confusion 

 with Codling Moth lamae. It is easy to understand that 

 larvae that frequent refuse in an orchard may readily 

 adopt the burlap bands placed around apple trees for 

 Codling Moth larval traps, as wintering quarters in the 

 autumn of the year. It is a matter of no surprise, there- 

 fore, to receive such larvae from field inspectors as 

 o.stensible Codling Moth larvae. It is surprising, how- 

 ever, to find larvae infesting mature apples in the field. 

 On several occasions we have found nearly mature lar- 

 vae in well defined tunnels, at least 8 mm. deep in the 

 flesh, in fresh fruit. "We have not been able to prove 

 that such larvae were not using some gallery previously 

 formed by some other insect, but we have undoubted 

 proof that these larvae feed freel\- on the flesh of fresh 

 fruit on the trees. The pi-esence of fresh frass in such 

 galleries with the larvae is sufficient evidence of the 

 truth of this statement. Confirmative evidence has also 



A. 



CYQIA FOMONE LLA 



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Cod. -■ M,., 



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ANARSiA LINEATCLLA P...-W.-.- 



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ENARMONIA PRUNIVORA L.... A^.,\v 



been cbtained by laboratory experiments, but .such labor- 

 atory tests incline us to the belief that the fruit infest- 

 ing habit is not normal. However, in view of the fact 

 that an occasional larva may infest apples, and so cause 

 confusion in the matter of identity, the following des- 

 cripticm is given of a mature larva : — 

 Plodia interputictella. Length 12 mm. General colour 

 creamy to pinkish white, the last three abdominal seg- 

 ments often paler than the remainder of the body. 

 Head orange to orange-brown and of a uniform colour 

 with the exception of the mouth parts which are dark 

 brown. Thoracic shield lighter in colour to the head, 

 almost transparent white along the anterior margin. 

 Tubercles on body prominent and often pigmented 

 brown. The bisetose kappa group on the prothorax 

 readily separates this larva from the (,'odling Mfith. 

 The two species of the Gelechiidae may be readily 

 separated from one another by their different food 

 plants as their common names imply. Anarsia linea- 

 tella may. however, be confused with the Codling Moth 

 and other fruit-infesting insects and for this rea.son 

 may be dealt with briefly. The Gelechiidae may be 

 recognized by the trisetose kappa group of the prothorax 

 and the width between the setae beta on the 9th abdo- 

 minal segment in relation to the other abdominal seg 

 ments. 



Larval characters. Aiiarsia lineafella. 



Mature larva measures half inch in length, cylindrical 

 in outline. General colour reddish-brown with head, 

 prothoracic shield and anal plate black. Intersegmen 

 tal tissue dull white in colour. Anal plate furnish- 

 ed dorsally with many hairs of varying lengths. Anal 

 fork present, almost black in colour, with divergent 

 teeth bifurcated at the tips. Spiracle on segment 8 

 of the abdomen very large. Prolegs short with well 

 developed crochets arranged in a pair of transverse 

 bands, usually biordinal, those on anal prolegs in two 

 groups. Spiracle on prothoracic segment usually con- 

 tained on the kappa group of setae. Kappa and eta 

 on 9tli abdominal segment combined, mu absent. 



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niNEOLA TRICOLORCLLA 



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PLODIA 



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EPICALLI'^IA PmiDltLLA 



SETAL MAPS 



