370 BOARD OF AGRICULTURE. [Pub. Doc. 



should be put on the trees about October 1 and freshened 

 the following spring. If left on during the summer these 

 bands will prevent such trees as have been properly cleaned 

 of the eggs of the tussock moth from becoming infested 

 with the caterpillars of this insect. Raupenleim may be 

 purchased in the market at from ten to fifteen cents per 

 pound, according to the quantity desired. 



At the suggestion of Professor Smith, Prof. F. L. Nason 

 of the New Jersey Agricultural College, New Brunswick, 

 N. J., has conducted a series of investigations concerning 

 the composition of Raupenleim, and has at last succeeded 

 in preparing a substance almost identical with the foreign 

 product. Professor Nason's compound is known under 

 the name of " dendrolene," and is nearly if not quite as 

 effective as the Raupenleim. It may be purchased at about 

 six cents per pound, and is well worth a trial in protecting 

 trees against canker-worms. 



While this paper is intended to treat of insecticides rather 

 than insects, a few additional words concerning the applica- 

 tion of some of these methods in combating the canker-worm 

 and tussock moth may not be inappropriate, since these in- 

 sects have been unusually abundant in many parts of the 

 State this year. 



The apple orchards of eastern Massachusetts were, as a 

 rule, seriously damaged by the canker-worms, and in some 

 orchards the fruit crop was almost a failure from this cause. 

 The ravages of this pest can be obviated by banding the 

 trees with Raupenleim or tar, as already indicated, to pre- 

 vent the ascent of the female moths. 



The canker-worms being of two kinds, fall and spring, 

 this work should be done early in the fall and the bands kept 

 fresh up to the time severe cold weather sets in, and should 

 also be put in working order with the advent of warm 

 weather in the spring. The wingless female moths ascend 

 the trees on warm days to lay their eggs, and the same 

 weather that will bring them out will also soften the bands 

 — if they have been properly put on — and make them suf- 

 ficiently adhesive. to catch the moths. 



