292 THE MONTHLY BULLETIN. 



CALENDAR OF INSECT PESTS AND PLANT 



DISEASES. 



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



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



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



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

 growers.] 



DECIDUOUS FRUIT INSECTS. 



The Apple Worm. 



It is often necessary to spray a third time in order to control the 

 destructive apple worm. This application is made from four to six 

 weeks after the second, or six to ten weeks after the first spraying was 

 applied before the calyx cups had closed. Use arsenate of lead, five 

 pounds to one hundred gallons of water. 



The codling moth larvae also attack the green, soft shelled walnuts on 

 the tree. S. W. Foster in Part V, Bulletin 80, Bureau of Entomology, 

 U. S. Department of Agriculture, states that the majority of the worms 

 bore through the soft shell and feed upon the kernel inside. Some, 

 however, feed .only in the green hull. These worms are usually the 

 young of the belated individuals issuing from the first brood of the 

 codling moth which had infested the apples and pears. The worms 

 appear in the nuts in August and September. Spraying with arsenate 

 of lead, five pounds to one hundred gallons of water, in August will 

 probably check their ravages on walnuts. 



The Cherry and Pear Slug. 



The pear slug is a dark, olive-green slimy worm, the fore part of the 

 body being enlarged. It strips the upper green surface of the leaves 

 causing them to turn brown and die. This pest is easily controlled 

 by blowing lime and dust on the infested leaves, spraying with the 

 ordinary soap and emulsion sprays, or by using arsenate of lead, four 

 pounds to one hundred gallons of water. The poisoned spray is slower 

 in action than the soap sprays, as the slugs must eat the poison to be 

 destroyed. 



Red Spiders. 



Several of our deciduous fruit trees, notably the almond, peach and 

 prune, are subject to the attack of the red spiders. One of these is the 

 so-called brown mite. This species is redclish in the younger stages 

 and brownish in the adult, and is very minute. It does not spin a 

 web. Infested leaves have a faded-out, spotted appearance. The two- 

 spotted mite in contrast with the brown mite spins a conspicuous web. 

 It also produces a spotted effect on the leaves. This mite is usually of 

 a greenish or yellowish color with two dark spots on the body. Dusting 

 Avith flowers of sulphur under favorable weather condition — a night 

 when dew is plentiful, followed by hot days- — is advocated by many 

 growers. Lime-sulphur solution is liable to produce injury by burning 

 at this time of the year. The atomic sulphur spray: 10 pounds of the 

 atomic sulphur to 100 gallons of water, is another aracnicide. 



