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ENTOMOLOGICAL SOCIETY. 



55 



the maple trees they attack ; but they are rarely to be found in numbers 

 two years running, and as they work late in summer they do not injure the 

 trees very much, the leaves having by that time nearly completed the dis- 

 charge of their functions. If found to be necessary, a simple remedy would 

 be to rake up the leaves, including the cases, under the trees and burn them 

 on the spot. Dr. Fletcher, in his E-eport for 1885, records an attack by this 

 insect on maple trees in the neighborhood of Ottawa, and also relates a 

 similar visitation in Missisquoi County, P. Que., described by the Kev. Dr. 

 Fyles in the year 1881. 



The Spruce Gall-louse (Chermes ahietis) Fig. 17, has become a serious 

 enemy to spruce trees and is causing much trouble and anxiety to the growers 

 of these ornamental trees in many parts of the Province. It is very abun- 

 dant at Guelph, Gait, Minden, Chatham and various other places. As it 

 has frequently been described and referred to in these Annual Reports, It 



Fig. 17.— Spruce Gall-louse, a, summer form of nymph ; h. affected twig. 



may suffice to mention now that good results have been obtained by spraying 

 affected trees at the time the young plant-lice are exposed with a tobacco 

 and soap wash or with kerosene emulsion. This should be done in May when 

 the young lice emerge from the eggs and before they are enclosed in the galls, 

 and also towards the end of August when the winged forms come out of the 

 galls. The terminal shoots should be watched at those times and the spray- 

 ing performed as soon as any of the insects are to be seen moving about. 

 They are so minute that a magnifying glass will be required to see them. 

 The spraying should be repeated two or three times at short intervals, as the 

 insects do not all come out at the same time. 



The Larch Saw-fly {Nematus Erichsonii) is still fo be found here in a 

 small plantation on the College premises. ToAvards the end of July full- 

 grown larvae were found, which assumed the chrysalis stage a few days after 

 they were collected (July 2-3). There had evidently been a serious attack 

 in the spring, as nearly all the boughs had a very short and scanty clothing 

 nf light green foliage, contrasting strongly with the deeper hued and much 

 long-er needles on the branches that had not been defoliated. The ground 



