THE MONTHLY BULLETIN. 



477 



CALENDAR OF INSECT PESTS AND PLANT 



DISEASES. 



By E. J. VOSLER. 



[Tinder the above heading the author aims to give brief, popular descriptions and 

 methods of controlling insect pests and plant diseases as nearly as possible just prior 

 to or at the time when tlie suggestions given should be carried into effect by the 

 growers.] 



DECIDUOUS FRUIT TREE INSECTS. 

 The Fall Canker Worm. 



What the Insect Is. — The fall canker worm is one of the moths which 

 is destructive to the various deeidnous fruit trees, such as the apple, 

 I)rune, cherry and apricot. The wingless females issue from the rest- 

 ing stage during October and on into December, to deposit their eggs on 

 the bark of the host plants. The number of eggs per mass varies from 

 approximately 60 to 200. The larvce of this insect defoliate the trees. 



Fig. 101. — The fall cankerworm, Alsophila pometaria 

 (Harris). Larva in characteristic feeding attitude on 

 apricot leaf. Enlarged twice. (After Essig, Inj. and 

 Ben. Ins. of Cal., revised edition.) 



How to Control. — Tanglefoot bands placed around the tree trunks 

 during September and October, will trap the females as they ascend the 

 trunks to deposit their eggs. If these bands are made of materials 

 which are affected by the rains, they must be renewed occasionally. 



The Brown Apricot Scale. 



What the Insect Is. — One of the most destructive insects attacking 

 deciduous fruit trees is the brown apricot scale (European fruit lecan- 

 ium). The adult scale is oval in form, one and one-half inches in 



