48 



2nd at College Park, indicating that the larvae hatching therefrom 

 will probably live over winter. Pupae have been found as early as 

 April 8th, but it is believed that this is an abnormally early date. 

 The major injuries seem to occur in late May and early June. The first 

 adults have been taken on June 27th. The second brood seems to ex- 

 tend over a longer period, the adults having been taken from July 31st 

 to August 19th. The final adults appear about the first of October. 

 While no control measures have been practiced against this insect it 

 would seem that the three arsenical spray^s advised for the shoot borer 

 would be effective in controlling this pest. 



Late Appearing Insects that Defoliate the Trees 

 The Walnut Caterpillar 

 (Datana intergerrima G. R.) 

 The larva of this insect is nearly black, clothed sparsely with long 

 silvery hairs, and when full grown measures about 1^ inches long. 

 When disturbed the larvae have the curious habit of elevating the head 

 and tail ends of the body. They completely defoliate the limbs upon 

 which they occur and sometimes devour all the foliage on small trees. 

 The major injury occurs in the state about the last of July or the first 

 week in August. In the South there are two full broods, but here. Ap- 

 parently, there is only one brood. The pest is easily controlled by 

 spraying with arsenicals. 



The Fall Web-Worm 

 {Hyphantria cunea Drury) 



The larval stage is a hairy, white caterpillar that lives with a large 

 colony of similar caterpillars within a web surrounding a group of 

 leaves and twigs. As the larvae grow, the web is enlarged and ulti- 

 mately a colony will destroy large amounts of foliage. 



The first generation does little damage as a rule, but frequently the 

 second brood devours considerable foliage and leaves ugly unsightly 

 webs on the trees. Like the walnut caterpillar, this pest is easily con- 

 trolled, and it is believed that the timing of the sprays as given on the 

 schedule will be effective in preventing major injuries by leaf feed- 

 ing insects and tend to promote earlier fruiting and better shaped 

 trees. 



Insects That Injure the Nuts 

 There are a number of weevils and curculios that injure nuts, but 



