14 THE EEPOET OF THE No. 36 



The Spruce Bud-woem {Tortrix fumiferana, Clemens). In my report last 

 year I mentioned an outbreak of this insect, w'hich occurred particularly in the 

 Upper Gatineau district, north of Ottawa. We had hoped that the outbreak of 

 1909 would not be repeated in 1910, but most unfortunately the insect was again 

 present in enormous numbers during the past season, not only in the Upper 

 Gatineau district, but throughout other areas in the Province of Quebec. In the 

 immediate vicinity of Ottawa the larvae could be found without difficulty on spruce 

 trees, but they were not present near the city in numbers sufficient to do noticeable 

 injury. At Ottawa, this year, many larvse were mature in the first week in June, 

 and specimens collected at that time produced the moths about two weeks later. On 

 June 27 many empty chrysalides were seen on spruce trees on the grounds of the 

 Central Experimental Farm. Female moths collected on July 16th deposited eggs 

 on July 18, the larvae hatching 7 days later. On July 23 thousands of the moths 

 were present in store windows on Sparks Street. 



The liARCii Sawfly (Nematus erichsonii, Hartg.), is continuing its ravages 

 all "hreugh tli; district. Many trees were seen which had been entirely defoliated. 

 At Ottawa I found the clusters of the eggs on May 28 and at that time some of 

 the young larvae were just appearing. 



Two other insects were very abundant on larches this year, viz., the Larch 

 Case-bearer (Ooleopliora laricella, Hbn.), and the Woolly Larch Aphid 

 (Chermes strdbilohius, Kalt.) The Larch Case-bearer made its first appearance at 

 Ottawa, as recorded by the late Dr. Fletcher, in 1905. Since then it has not 

 been abundant until the present year. The attack this year was very apparent 

 early in May. The moths began to emerge towards the end of that month. On 

 June 15, moths were seen in numbers around the trees. This autumn the larvae 

 are plentiful on the trees, in their small incomplete cases. On May 27, the 

 larches on the Central Experimental Farm were abundantly infested with the 

 Woolly Larch Aphid. Clusters of the brownish eggs were found at the fascicles 

 of the leaves on this date, and the young woolly aphids were scattered all over 

 the leaves, the white woolly secretion being very conspicuous. The young were 

 small and had only recently hatched. From one egg mass brought into the 

 Division, some young emerged May 31. 



The White-cedar Twig Borer (Argyresthia tJiuiella, Pack.) is this 3^ear 

 again present in numbers throughout the district. It is not, however, as numerous 

 as it was in 1905 and 1906, The tiny green larvte of this species bore inside of 

 the young tips of white cedar, causing the same to die, which injury, of course, 

 is conspicuous and gives the trees a sickly appearance. The partly grown larva 

 passes the winter within the twig where it has been working. 



The Maple Phenacoccus {PJienacocciis acericola. King). On many of 

 the trunks and lower branches of maple trees along the streets of Ottawa there are, 

 at the present time, small, but conspicuous deposits of a cotton-like waxy secre- 

 tion beneath which are colonies of this insect. Towards the end of SeptembL-r 

 adult females, which are light yellow in colour and about one-fifth of an inch long, 

 were tound and large numbers of eggs. These latter were noticed to be hatching 

 on Oct. 13. The young larvje, which winter on the trees, were, on hatching, white 

 with a yellowish tinge on the dorsum. As yet the trees are not seriously in- 

 fested but the insect has increased abundantly this year and, as it is capable of 

 doing important injury, if this continues, the trees may, of course, require some 

 treatment. This is the first record of the Maple Phenacoccus occurring in the 

 Ottawa district. 



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