-2- 



Some clover leaf weevil larvae are also present, but they are nearly through 

 feeding and beginning to pupate in this area. Collections show that between 20 and 

 ^0 percent of these are parasitized by a wasp. Clover leaf weevil populations else- 

 where in Illinois remain low and it does not appear that insecticide treatment will 

 be needed. 



Fungus flies are appearing in wheat fields, particularly wheat grown on soy- 

 bean stubble. These small, black, gnat -like flies are developing in wet? decaying organic 

 matter and are usually not pests of the wheat plant. 



Armyworm moths are moving northward from states to the south of us. These 

 first moths will lay eggs in grass, fence rows, ditchbanks, roadsides, and pastures 

 where plant growth is thick and rank. It is too soon to predict whether or not army- 

 worms will present a problem. 



Face flies are present on cattle in small numbers. These are the over- 

 wintering adults leaving their hibernating quarters to begin laying eggs for the first 

 spring generation which will emerge in late May or early June. Cattle pastured near 

 wooded areas generally are more heavily infested at this time than cattle pastured in 

 prairie areas away from woods. In addition to overwintering in homes and farm build- 

 ings, some face flies apparently hibernate in wooded areas as well. 



Spring cankerworms may appear soon in many areas in trees where tanglefoot 

 bands were not used late this winter to prevent some of the moths from migrating up 

 the trees and laying their eggs. They particularly like American elm and apple trees 

 but will also attack other fruit and shade trees. Many trees may be partly or com- 

 pletely stripped of their new spring foliage by these measuring worms. When full 

 grown the worm drops to the ground by means of a silken thread. In a wind these 

 threads become tangled and appear as streamers, but by this time it is usually too 

 late for control. When the worms are still small (less than one inch), an application 

 of a spray containing 1 1/2 pounds of 80 percent carbaryl wettable powder or k pounds 

 of lead arsenate wettable powder per 100 gallons of water will control them. 



Caution : Before applying insecticides, read the labels carefully and fol- 

 low all precautions. This not only will insure personal safety, but will also elimi- 

 nate residue hazards. 



*■■*■*##- -x-**-** 



This weekly report was prepared by H. B. Petty, Steve Moore, Roscoe Randell, 

 and Clarence E. White, Illinois Natural History Survey and University of Illinois 

 College of Agriculture, in cooperation with the USDA Agricultural Service, Plant Pest 

 Control Branch, from information gathered by entomologists and cooperators who send 

 in weekly reports from their own localities. 



HBP:SM:RR:CEW:ml 

 V23/65 



