212 THE MONTHLY BULLETIN. 



CALENDAR OF INSECT PESTS AND 

 PLANT DISEASES. 



By E. J. V iSLER. 



[Under 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 the suggestions given should be carried into effect by the 

 growers. ] 



DECIDUOUS FRUIT INSECTS. 



The Codling Moth. 



The time for the second spraying for the codling moth worm, which 

 eats into the fruit of the apple and pear trees, is about three weeks 

 after the first spray, which should have been applied when practically 

 90 per cent of the petals had fallen. The object of this spraying is 

 to coat the young apples with the arsenical poison, so that when the 

 3^oung worms endeavor to enter the fruit they will, on eating through 

 the skin, consume the poison and thus be destroyed, the first applica- 



pjf;_ -^i), — Tho red-humped caterpillar, Schisnra concinna S. & A. ; a, adult moth ; 

 7^ egg cluster; r. larvpe or caterpillars; d, pupa; e, cocoon. About natural size. 

 (Original.) 



tion lieing merely to fill the calyx cups with the poison before they 

 close. This second application should not be omitted if the worins 

 are at all numerous. Tlie strength of the arsenate of lead to use is 

 5 pounds of the paste to 100 gallons of water. If spraying for the 

 scab fungus is necessary at this time Bordeaux mixture, 5-5-50 formula 

 may be used with the arsenate in order to save making two applications. 



The Red-humped Caterpillar. 



Considerable damage is often done during the growing season by the 

 red-humped caterpillars, which are common on the walnut, apple, prune, 

 plum and cherry during that time. The work of the caterpillars con- 

 sists in stripping the leaves from the branches of the host plant. The 

 larva is usually recognized by the coral-red hump on the fourth seg- 

 ment, the head being of the same color and the body striped with slender 



