212 



adults in about 6 days. This midge is most abundant and destructive 

 in summer, but declines in numbers at the beginning of autumn and 

 finally disappears by November. It hibernates in the soil and does 

 not reappear again till early March 



Total eradication has been experimentally effected by sprinkUng 

 tobacco dust over the beds from I inch to I inch in thickness to 

 prevent the falling larvae from entering the soil, this treatment being 

 followed by nightly fumigations with tobacco paper, continued as 

 long as any adults were seen. As an additional precaution all the 

 walks were sprayed with a 5 per cent, kerosene emulsion to kill any 

 larvae that might have fallen on to them from the plants. In practice 

 the midge may be held in check by fumigating with nicotine every 

 night as soon as the pest is observed in spring, the treatment to be 

 repeated at any time that it threatens to be troublesome. Infested 

 shoots and buds should be at once pinched of? and destroyed. Another 

 method, not yet tested, by which extermination might be effected 

 in a greenhouse, would be by drying off all the rose plants at the same 

 time during the summer, when the insect would die of starvation. 

 Prevention could also be effected by growers propagating their own 

 roses ; by obtaining new stock from non-infested houses ; by pur- 

 chasing before the end of February stock planted in November or 

 December, which, therefore, has not been exposed to infection ; by 

 washing the root soil from plants obtained later than February, such 

 soil being either burned or scalded with hot water or steam. 



Anderson (W, B.). Notes on the Tussock Moth, Hemerocampa vetusta 

 gulosa, Hy. Edw., in Britis'i Columbia. — Agric. Gaz. Canada, 

 Ottawa, vi, no. 2, February 1919, p. 139. 



The larvae of Hemerocampa vetusta gulosa were found in August 

 1918 attacking Douglas firs over an area of about | square mile on 

 the Thompson River, British Columbia, and many pupae taken at 

 that time were found to be parasitised. The yellow pine {Pinus 

 ponderosa) is also attacked, but much more sparingly. The attack 

 begins at the top of the tree and works downwards, the entire tree 

 being usually defoliated and killed outright, no later growth occurring 

 as is the case after defoliation by Tortrix {Harmologa) fumiferana 

 (spruce budworm). 



Caesar (L.) & Ross (W. A.). Control of the Apple Maggot. — 

 Canadian Horticulturist^ Toronto, xUi, no. 2, February 1919, pp. 

 27-28. 



The results of field tests conducted in various parts of Ontario 

 and spread over 5 consecutive years and corroborated by laboratory 

 tests justify the confident belief that the apple maggot [Rhagoletis 

 pomonella] can be successfully controlled in apple orchards by sprapng. 

 The first application should be given just before or as the adults 

 begin to emerge, the date varying with the climate of the locality 

 from the last week in June to the second week in July. The second 

 application should be made when the result of the first is beginning 

 to disappear, usually in from 2-3 weeks. In wet seasons a third 



