Plants as Affected by Animal Parasites. 177 



313. The Codling-Moth,* which causes so-called 

 "wormy" apples and pears, is controlled by spraying 

 the trees at the time of egg deposit, with water contain- 

 ing Paris green (284). The first spraying should be 

 given as soon as the petals (142) fall, to be followed 

 by a second six to ten days later. Another application 

 is necessary in some states to control a second brood 

 of this insect. The time will vary in different states. 

 In Wisconsin July 15 to' 30 is about the proper date, 

 depending upon the season. A drop of poisoned water 

 should be lodged in the calyx (141) of every fruit, 

 and as this evaporates, the poison deposited on the 

 skin kills the newly-hatched insect as it eats its way 

 inward. 



A band of cloth or paper, placed about the trunk of 

 fruiting apple or pear trees forms a convenient retreat 

 for larvae of the codling-moth, in which to pupate. 

 They may then be readily destroyed by removing the 

 band. The bands should be a few inches wide, and 

 should be put on before midsummer. They should be 

 taken off once in ten to fourteen days, until the fruit 

 is harvested, and all cocoons beneath them should be 

 crushed. 



314. The Plum Curculio (306) that so often stings 

 young plums, causing them to drop before maturity, is 

 controlled by jarring the beetles, that deposit their eggs 

 in the young fruit, upon sheet-covered frames very 

 early on cool, still mornings while their muscles are 

 stiff (Fig. 76). The jarring should begin almost as 

 soon as the petals (142) fall and should be repeated 



• Carpocapsa pomonella . 



