December. '16] GRAHAM: WHITE PINE WEEVIL 549 



(17) Laboulbene. Insectes tuberivores. Ann. Ent. Franc, 1864, 4th series IV: 



p. 69. 

 (IS) Pastejrik. MetamoriAosis of S. silvatica. Casopis ceske Spolecnosti Ento- 



mologicke, 1907, IV: pp. 6-7. 



(19) PoPENOE. Sciara in Mushrooms. U. S. Dept. Agri. Div. of Ent., 1912, Cir. 155. 



(20) Pratt, F. C. . Sciara Larva;. (S. fraterna Say.) Pro. Ent. Soc. Wash. 1897, 



IV: p. 263. 



(21) Riley, C. V. Yellow Fever Fly. American Naturalist, 1881, XV: p. 150. 



(22) Thompson, U. R. Sur un diptere parasite de la larve d'u mycetophiUdae. 

 ' Comptes Rendus, LXXVIII: pp. 87-89. 



(23) Van der Wulp. Dipterologische aanteekeningen. (Notes on the economy 



of Dutch species of MycetophiUdae.) Tijdschrift voor Entomologie, 1874, 

 XVII: pp. 114-124. 



Plate 41 

 Figure 1. Female Sciara copwphila. 



Figure 2. Female ovipositing showing the wings in nearly their normal position. 

 Figure 3. Male Sciara copropJiila. 

 Figure 4. Eggs of Sciara coprophila deposited in a crevice in the upper surface of a 



bit of potato tuber. 

 Figure 5. The maggot of above named fly. 



Figure 6. Pupa on surface of potato showing the nature of its pupal chamber. 

 Figure 7. Adult 9 nematode with egg capsule dissected from an infested maggot. 

 Figure 8. Device for studying the food habits of the maggots. 



Figure 9. Enlarged view of pupa shown in Figure 6, to show the chamber of bits of 

 foreign material tied together with silk fibres. 



Plate 42 

 Figure 1. Geranium slip killed by the work of Sciara maggots. 

 Figure 2. Geranium plants that owe their straggly appearance to the work of the 



maggots in the soil. 

 Figure 3. Close view of lower portions of plant shown in Figure 1. 

 Figure 4. Begonia plant in a poorly drained vessel with a soil rich in manure. An 



ideal place to breed Sciara. 

 Figure 5. Corn roots riddled by the maggots. 

 Figizre 6. Geranium plant and its curtailed root system. 



NOTES ON THE CONTROL OF THE WHITE PINE WEEVIL 



By S. A. Graham 



Yearly the white pine weevil, Pissodes strobi Peck, takes its toll of 

 young white pines and Norway spruces, and in recent years it has 

 received considerable attention not only from entomologists, but from 

 foresters and nurserymen as well. A number of control measures have 

 been suggested, some of which are undoubtedly valuable under favor- 

 able conditions. 



During the past season the writer has applied different materials at 

 various strengths as sprays and washes to the young pines, in an 



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