EXPERIMENT STATION REPORT. 571 



fruit. In the more northern parts of the State where a single 

 brood is the rule, the careful horticulturist does not suffer so much 

 from his negligent neighbors, but further south, where there is a 

 partial second brood of considerable extent, mid-summer infesta- 

 tion is sometimes quite serious. Spraying against these second 

 crop worms is not practiced generally, if at all, in New Jersey, 

 and at best, is not nearly so effective as the applications against 

 the first brood, because of the difference in habits of the insects. 



Any method that will be likely to lessen the injury done by the 

 second brood, small as it is in proportion to the first, should 

 receive the attention of growers and I have several times called 

 attention to the value of trap bandings to attract the full grown 

 larvae. This method is in universal use in European countries and 

 is about the only measure in general use. For some reason, how- 

 ever, the recommendation has not been fa\-orably received nor 

 generally acted upon. But the Alessrs. Repp, of Glassboro, did 

 act upon it with excellent results, and their experience has led sev- 

 eral others with orchards of considerable size to follow. For this 

 reason it seems advisable to describe the method in some detail 

 and to explain hovv it acts. 



The larva of the Codling Moth, or apple worm, when just 

 hatched, makes its way to the blossom end of a young apple, thett 

 usually of hazel nut size or thereabouts, and after a little feeding 

 on the outer surface, bores into the fruit to the core, working 

 around the seed capsule. Spraying wntli a proper arsenite at the 

 proper time, lodges a coating of poison in the calyx cup where the 

 insect does its first feeding, and kills it before the apple is entered. 

 After it has entered the fruit, the insect i? beyond the reach of in- 

 secticides and becomes full fed about mid-summer, whether the 

 apple remains on the tree or drops to the ground — provided the 

 drop has not been before the insect became half grown. 



When full growth is attained, the larva or "worm" leaves the 

 apple and hunts a hiding place for its further development. Usur 

 ally, but not necessarily, that hiding place is on the tree itself, 

 under a loose bark scale on trunk or branch. A thin cocoon or 

 covering of whitish silk is spun around it, and there the larva lies 

 unchanged, until the following spring in a one-brood region, or 

 for a week or two only, where two broods develope. Then comes 

 the change to the pupal stage, which lasts only a few days before 

 the adults emerge. If they are mid-summer adults, the larvae or 

 "worms from the eggs laid by them enter the apples or pears at 

 almost any point; but by preference either at the calyx end or 

 where two apples touch. These larvae mature in early September, 



