THE MONTPILY BULLETIN. 183 



CALENDAR OF INSECT PESTS AND PLANT 



DISEASES. 



By E. J. VosLER, Assistant Superintendent of the State Insectary. 



(Umler the above heading the author aims to give brief, popular descriptions and 

 methods of controlling insect pests and plants as nearly as possible just prior to or at 

 the time when the suggestions given should be carried into effect by the growers. The 

 material is, for the most part, compiled from the various state and Government 

 publications.) 



DECIDUOUS FRUIT INSECTS. 



The Codling- Moth. 



The second application of the arsenate of lead spraj' for the codling 

 moth — that insect causing wormy apples and pears — should be made 

 three or f<iiir weeks after the petals of the l)l()s.soins have fallen. The 

 strength of the poison to use is 5 pounds to 100 li'alluns of water. Most 

 of the growers favor a rather coarse driving spray. 



Caterpillars Destructive to the Foliage. 



Various species of caterpillars are to ])e found feeding on the foliage 

 of deciduous trees in tlie spring and throughout tlie summer. Among 

 these are the hairy, ])lack and yellow tent caterpillars, which spin a web 

 or tent in which they congregate when not feeding; the red hump cater- 

 pillars, with their prominent red humps on the fourth body segment ; the 

 webworms, hairy and of a yellowish-green color with dark stripes, 

 spinning webs from which they emerge to feed on the leaves; the larvae 

 of the brown day moth, dark colored with fine red stripes on the body 

 and covered with long hairs ; the canker worms, dark colored without 

 hairs, and other species. With the caterpilhirs making tents or webs, 

 a good method of clestruction is to burn out the webs or tents containing 

 the worms with a torch. With those that feed in colonies, particularly 

 when very young, pick off the infested leaves on which they congregate 

 and burn them. If the caterpillars are scattered spray the foliage with 

 arsenate of lead. 3 pounds to 50 gallons of water. The caterpillars will 

 eat the leaves covered with the poison and soon die. 



Plant Lice. 



Several species of plant lice attack the young shoots and foliage of 

 deciduous trees. They suck the juices from their host, and in order to 

 destroy these small soft bodied greenish or dark colored insects a eon- 

 tact insecticide is necessary. One of the best sprays to use consists of 

 blackleaf 40,. three fourths of a pint, soap 3 to 4 pounds, water 100 

 gallons. Use a strong pressure of from 150 to 200 pounds, and do 

 thorough work. This spray can be combined with the arsenate of lead 

 spray for the apple worm. 



The Flat-headed Apple Tree Borer. 



The adult insect is a greenish-black beetle. The larvae are of a yel- 

 lowish color, legless, and have the anterior portion of the body at the 

 back of the head enlarged and flattened. Of the fruit trees the prin- 



