163 



Brittain (W. H.). Experiments in the Control of the Cabbage Maggot 



{Chortophila brassicae, Bouch6) in 1920.— Proc. Ent. Soc. Nova 

 Scotia, 1920, Truro, no. 6, March 1921, pp. 54-73, 4 tables, 1 plate. 

 [Received 23rd January 1922.] 



Experiments in the control of Phorbia {Chortophila) brassicae, Bch. 

 (cabbage maggot) were continued on the lines of the previous year, 

 and the results are shown in tables [R. A.E., A, ix, 127, 385]. Corro- 

 sive sublimate, creosote clay, anthracene oil-clay and tar-paper discs 

 caused no deaths among the plants, and a tobacco corrosive sublimate 

 and clay mixture only one. Corrosive subUmate gave the best yield. 

 Experiments were undertaken to determine at what stages the insects 

 were susceptible to corrosive sublimate and derris. Neither material 

 was effective in the case of fully grown larvae. As larvae of the second 

 generation were scarce, those of Hylemyia antiqua, Mg. (onion maggot) 

 were used and were found to be killed by corrosive subhmate. 



^ GiLLiATT (F. C). The Brown-tail Moth Situation in Nova Scotia.— 

 Proc. Ent. Soc. Nova Scotia, 1920, Truro, no. 6, March 1921, 

 pp. 74-80. [Received 23rd January 1922.] 



The history of the increase of the brown-tail moth [Nygniia phaeor- 

 rhoea, Don.] in Nova Scotia is reviewed. Owing to inspection work, 

 parasitic enemies, climatic conditions and spra>ang measures, this moth, 

 which was steadily increasing up to 1913-14, is now well under control. 

 The parasites include Apanteles lacteicolor, the larvae of which hibernate 

 in the larvae of the host. It has been liberated in the Annapolis 

 Valley and is now well established. The Carabid, Calosonia sycophanta, 

 and the Tachinid, Compsilura concinnata, have also been liberated, 

 but their establishment has not yet been proved. 



The results of exposure experiments show that where the tempera- 

 ture does not drop lower than 10° below zero, it cannot be a controlling 

 factor. For each degree of cold below —10 mortality increases, at 

 —20, 65-85 per cent, of the larvae succumb, and at —25, 100 per 

 cent. In well sprayed orchards there has never been a serious 

 outbreak of this pest. Only early sprays are effective, and the last 

 regular spray of the season kills all newly hatched larvae in the autumn. 



DusTAN (A. G.). Some Notes on the Habits ol 'Campoplex pilosidus, 

 a Primary Parasite of the Fall Web-worm.— Pwc. Ent. Soc. 

 Nova Scotia, 1920, Truro, no. 6, March 1921 , pp. 81-88 [Received 

 23rd January 1922.] 



The results of an investigation on the habits of Campoplex pilosulus, 

 a primary parasite of Hyphantria cunea, Drury, are given, with a 

 brief account of its life-his"tory. Oviposition occurs in the larvae that 

 are outside the protecting web. The parasitic larvae on hatching 

 feed on the blood of their host, then pupate in the skin. After five or 

 six days the adults emerge, and fertilisation takes place immediately, 

 though no eggs are deposited in the autumn. The adults hibernate 

 in old wood until the spring. It is possible that these oviposit in 

 some early feeding larvae and that the adults of another generation 

 parasitise the fall web-worm, or they may attack this host only. 



