296 



STATE BOARD OF AGRICULTURE. 



As the worms feed on elm, cherry, basswood, plum, and several other trees, it 

 will be necessary to band such trees also in order to keep the worms from 

 breeding on them and reinfesting the fruit trees. 



yd 6 



ISpring Canker-worm. 



•^S^K 







r.j 



J 



Fall Canker-worm. 



Fig. 13. — Canker Worms, from Riley, Eighth Rep. State Entomologist of Mo. 



Spraying. — The most practical and eflBcient method, however, is spraying. 

 Spray with paris-green when the worms first appear, and apply very carefully. 

 The writer has had very good results with paris-green used at the rate of one 

 pound to one hundred and seventy gallons of water. See directions for preparing 

 Insecticides. The worms usually appear just before blooming time, and may 

 remain for a short time after the blossoms fall. In the case of the canker-worm, 

 one is able to be prepared beforehand, for they spread with comparative slowness 

 and thev rc-appoar from yoar to voar. Sprav just as .soou as thov appear, of course 

 abstaining during the time of bloom, and spray twice if necessary, paying par- 

 ticular attention to the nozzle used. Do not rely on throwing a spray to any 

 distance. Reach the foliage with an extension and be sure that the spray is 

 fine and fog-like. Be sure to stop just before the trees commence to drip. Very 

 good work can be done with a fine Vermorel, cyclone, McGowan, or some other 

 similar nozzle which will spread an even coat of poison without throwing large 

 drops. 



Apple-tree Tent-caterpillar. {CUsiocavipa americana.) 



Familiar to all are the large, sticky webs or nests to be found in apple trees 

 early in the season, just after the foliage comes out The nests contain colonies 

 of caterpillars sometimes two inches long, dark brownish in color with a white 

 line down the back and blue markings on each side. These large caterpillars go 

 out and feed all over the trees, spinning fine lines wherever they go and for the 

 first part of their existence at least, dutifully returning to the nest at night, 

 Remaining there in lowery or very cold weather. When full grown they spin 

 oval cocoons of silk in partially concealed situations. The cocoons are notable 

 for having a quantity of yellow powder mixed with the silk. The adults are 

 moths, yellowish-brown in color, and spread something over an inch from tip 

 to tip of the extended wings. They have two cream colored lines running 

 obliquely across the front wings enclosing bands of lighter yellow. The eggs 

 are laid in masses or clusters, all the eggs of one female being placed in a ring 

 about a small twjg, forming a characteristic, waxy thickening with rounded 

 ends. Such an egg-cluster looks very much as if a small piece of chewing-gum 

 had been wound about the twig and then smoothed and allowed to harden. Over 



