267 



should be destroyed whenever found by knocking them from the trees 

 and crushing them. In nurseries and parks, heavy infestations should 

 be combated before the larvae are full-grown by spraying very thorough- 

 ly. A lead arsenate solution containing 2 lb. powder in 50 U.S. gals, 

 water should be satisfactory. For young larvae, less than | inch long, 

 nicotine sulphate is fairly satisfactory, but in view of the resistance of 

 conifers to arsenical sprays, and of the fact that an arsenical treat- 

 ment gives more certain results, the former spray should be used 

 almost exclusively. Whenever these insects have occurred and have 

 been dealt with the territory should be carefully surveyed for the 

 suceeding fourteen months, as some larvae may have escaped treat- 

 ment and a new infestation may arise. 



A^. lecontei appears to have three primary food-plants, Finns bank- 

 siana (jack pine), P. resinosa (red pine), and P. virginiana (scrub pine), 

 and a number of secondar}^ or possible ones, not capable of supporting 

 all the stages or of being entirely acceptable for oviposition. These 

 are P. strobus, P. sylvestris, P. taeda, P. contorta, P. monticola, P. 

 mughns, P. eldarica, P. ponderosa, P. palustris, P. austriaca, and Larix 

 americana. 



This sawfly is subject to the attack of a wilt, probably a bacterial 

 disease, and to infestation by parasitic insects, including the Hymenop- 

 tera, Exenterus diprioni, Rohw., Lagorotis diprioni, Rohw., L. vir- 

 giniana, Rohw., and Perilampus hyalinus, Say, and the Diptera, 

 Phorocera daripennis, Macq., Adomonita demylus, Wlk., Neopales 

 maera, Wulp, and Spathimeigenia spinigera. Towns. Of the Hymenop- 

 terous parasites, L. diprioni is much the most abundant species and 

 P. hyalinus is probably a hyperparasite. It is, however, certain that 

 none of these natural enemies is sufficiently numerous or effective 

 to permit disregard of the combative measures suggested above. 



Greene (C. T.). U.S. Bur. Ent. Dipterous Parasites of Sawflies. — 



Proc. Ent. Soc, Washington, D.C., xxiii, no. 2, February 1921, 

 pp. 41-43. 



The parasites recorded include : — Tachina rustica, Fall., and T. niella,. 

 Wlk., bred from Macremphytus variana, Nort. ; Phorocera claripennis, 

 Macq., from Neodiprion lecontei, Fitch, and A^. virginiana, Roh. ; 

 Spathimeigenia spinigera. Towns., from A^. edivardsi, Nort., A'', lecontei, 

 N. affinis, Roh., and other species of this genus ; Admontia hylotomae, 

 Coq.. from Arge sp., N. lecontei, and another sawfly ; Sturmia sp., 

 from Arge sp. ; Masicera sp., from A^ lecontei ; Frontina armigera 

 Coq., and Exorista petiolaia, Coq., from Neodiprion sp. 



Geismer (L. M.). The Tachina Fly {Phorocera dorvphorae), an interest- 

 ing Parasite on Potato beetles.— Po/a/o Mag.' iii, no. 3, 1920, p. 8. 

 (Abstract in Expt. Sta. Record, Washington, D.C., xliv, no. 3, 

 21st March 1921, p. 255.) 



Attention is called to the control of the Colorado potato beetle 

 [Lcptinotarsa decemlineata] in certain localities in the upper peninsular 

 of Michigan by the Tachinid, Doryphorophaga [Phorocera] dorvphorae. 

 In the summer of 1900, in certain localities of Alger County, the beetles 

 could scarcely be found, while in the vicinity of the upper peninsular 

 experiment station they were quite numerous, almost every adult, as 

 well as some of the larger larvae, being covered with from one to eight 

 or even more eggs of this parasite. The beetles were scarce in the 



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