350 



KuGGLEs (A. G.). Life-History of Oberea tripunctata, Swed. — Jl.Econ. 

 Entom., Concord, viii, no. 1, FeEmiary 1915, pp. 79-85, 6 figs. 



In June 1911, a new pest was found on the elm trees in Minnesota, 

 causing the destruction of the leaves on the terminal twgs. The 

 insect was at first beheved to be Oberea nlmicola, Chittenden, but 

 adults reared from the eggs were identified as 0. tripunctata. This 

 species was recorded by Forbes on elm and in 1911 on dogwood, but 

 until the time of these observations was not previously known in 

 Minnesota. The eggs are inserted under the edge of the bark by the 

 ovipositor, many twigs being completely girdled. The larvae hatch 

 in June and burrow into the wood, passing the winter in the tunnels 

 so formed. The pupal stage is reached in May of the second year 

 and the adult emerges in two or three weeks. Many larvae perished 

 in the burrow towards the cut end of the twig, possibly owing to some 

 parasite. Removal of infected twigs or proper pruning seemed to 

 be effective in controlhng the insects. 



Felt (E. P.). Fumigation for the Box Leaf-Miner. — Jl. Econ. Entom., 

 Concord, viii, no. 1, February 1915, pp. 94-96. 



The box leaf -miner, Monarthropalpus buxi, Lab., causes the shedding 

 of the leaves of the infested plants. The adults appear in the latter 

 part of May and there is but one generation annually. Experiments 

 have been made to ascertain the possibility of destroying the larvae 

 while still in the mines. Twigs were exposed to the action of various 

 gases ; 30 drops of carbon bisulphide with an exposure of three and 

 one-half hours caused the death of the larva, while the fohage was 

 uninjured. As the result of a series of tests, it was concluded that 

 exposure to the vapour of two teaspoonfuls of carbon bisulphide in a 

 ten-quart bell-jar for at least one, preferably two hours, was most 

 effective. Similar tests Avith carbon tetrachloride had no eftect on 

 the larvae. C. P. ammonia was fatal to them, but had also an 

 injurious effect on the leaves, especially when large quantities were 

 used. It is possible that small amounts would destroy the larvae ■ 

 without any serious injury to the plants. Flake naphthalene at the 

 rate of one-half teaspoonful to a two- quart jar with an exposure 

 of 5 hours caused the larvae to become quiescent, but they eventually 

 recovered ; there was no injury to the plant. With potassium cyanide, 

 some larvae were killed, while the plant was uninjured. Contact 

 sprays produced no results, owing to the thickness of the membrane 

 over the mine. During the discussion, H. T. Fernald expressed the 

 opinion that it was impracticable to apply fumigation methods, because 

 of the conditions under which the box is grown. The effect of poison 

 sprays on larvae or adults has not yet been determined. 



Gillette (C. P.) & Bragg (L. C.). Notes on some Colorado aphids 

 having alternate food habits. — JL Econ. Entom., Concord, viii. 

 no. 1, February 1915, pp. 97-103. 



Chermes cooleyi, Gillette, and var. coweni, Gillette, five throughout 

 the year on the Engelmann and blue spruces in one form, and the 

 Douglas fir in the other. The lice, at the time of observation, were 



