CRANBERRY INSECTS 463 



winter hiding places in the spring and lay their minute, disk- 

 like yellow eggs on the under side of the leaves. The eggs so 

 closely resemble the eggs of the black-headed worm that they 

 can be distinguished only with great difficulty. The eggs 

 laid by the overwintering motlis are fr(\sher and brighter than 

 those of the blac'k-head worm which have been exposed tc the 

 weather for several months. In New Jersey the overwintering 

 females lay their eggs in late April and early May. If the t)Ogs 

 are flooded at that time, they usually find a few exposed vines 

 around the dams and along the edge of the bog. The eggs hatch 

 in ten days and the larvae mature in late May or early June. 

 Pupation takes place in the nest of webbed leaves and the next 

 brood of moths fly in June. The second brood of caterpillars 

 are, as a rule, more abundant and destructive than the first; 

 they make larger nests and often web together six or seven 

 uprights and runners. They are especially fond of boring into 

 the fruits. A third brood of caterpillars feed during August 

 and September and give rise to a brood of moths that winter 

 over in sheltered places, under rubbish, etc. 



Control. 



The moths may be prevented from laying their eggs on the 

 cranberry vines in the spring by holding the winter flowage on 

 the bogs till about May 20 in Massachusetts, at which time 

 most of the moths will have disappeared. In the case of dry bogs 

 or where it is impracticable to hold the water on the bogs late 

 in the spring the yellow-headed worm can be readily controlled 

 by one or two thorough applications of arsenate of lead, 10 

 pounds in 100 gallons of water, spraying just as the eggs are 

 hatching. In Massachusetts the spraying for the second brood 

 should be made about the first week in July. 



References 



N. J. Agr. Exp. Sta. Bull. K, pp. 15-21. 1890. 



U. S. Dept. Agr. Farmers' Bull. 178, pp. 12-17. 1903. 



Mass. Agr. Exp. Sta. Bull. 115, pp. 13-14. 1907. 



