REPORT OF THE STATE ENTOMOLOGIST I916 6j 



Norway maple aphid (Chaitophorus 1 y r o p i c t a l Kcss- 

 ler) . This common plant louse on Norway maples is present almost 

 every year and occasionally becomes excessively abundant, as was 

 the case last summer with some Norway maples at Ogdensburg, 

 the trees being so badly infested that the leaves were fairly smeared 

 and almost dripping with the honeydew. This plant louse occurs 

 in clusters on the under side of the leaves, usually along the veins. 

 The young are pale greenish yellow with red eyes, while the fully 

 grown plant lice are greenish with conspicuous irregular brownish 

 red markings. Usually natural enemies, such as ladybeetles, both 

 young and adults, and Syrphus or flower fly larvae, reduce the num- 

 bers of the insect so greatly by midsummer that there is very little 

 injury thereafter. This aphid may be readily destroyed by thor- 

 oughly spraying the under side of the leaves with a nicotine-sulphate 

 preparation, 40 per cent nicotine, used at the rate of three-fourths 

 of a pint to 100 gallons of water and adding thereto 6 to 8 pounds 

 of soap. One thorough treatment is usually sufficient to control the 

 pest. 



Magnolia scale (Eulecanium magnoliarum Ckll.) . 

 This large scale insect, previously unrepresented in the state collec- 

 tions, was received the latter part of July through Dr G. G. Atwood 

 of the Department of Agriculture, accompanied by the statement 

 that it occurred on some magnolia trees at Dansville. This species 

 is one of the largest of our native scale insects, approaching closely 

 the size of the much better known tulip tree scale, Toumeyella 

 liriodendri Gmel., it being about one- third of an inch long, 

 one-fourth of an inch wide and one-tenth of an inch high. The 

 surface is a variable dark brown or blackish, more or less granular 

 and with low, warty protuberances at intervals. A badly infested 

 twig may have one side nearly covered with the insects, the scales 

 being crowded together much as in the case of the tulip tree scale. 

 Spraying as for the above-mentioned tulip scale would doubtless 

 be very effective in checking this magnolia insect. 



FOREST TREE INSECTS 



Hickory bark beetle (Eccoptogaster quadrispinosa 

 Say). Depredations by this well-known enemy of hickory trees 

 have decreased markedly during the last two years, though an exami- 

 nation in mid-July of a wooded knoll east of Troy showed general 



determined by Dr J. J. Davis. This is the Chait ophor us acerisofour 

 earlier publications. 



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