Allow four days between application and harvest when using naled, and seven days for 

 diazinon. 



HOMEOWNER INSECT PROBLEMS 



Bagworm hatch is complete in the northern part of Illinois; and the larvae are feed- 

 ing on evergreens, shrubs, and some trees. The newly hatched bagworms are conical 

 in shape, and are rather easily overlooked because of their small size. By late 

 summer, the bags will be 1-1/2 to 2 inches long and easy to spot, but it is too late 

 then to achieve good control. Sprays of diazinon, malathion, or Bacillus thuvingien- 

 sis (Dipel, Biotrol, Thuricide, and so on) will give control if applied now. Do not 

 use malathion on cannaert red cedar. Do not use diazinon on ferns or hibiscus. Fol- 

 low the directions on the label. 



Mimosa webworms have begun to feed on mimosa and honey locust trees. They web the 

 leaves together to form a nest and feed inside this enclosure, where they skele- 

 tonize the leaflets. Badly damaged leaflets become dry and brown. These pale gray- 

 to-brown worms have five white stripes running lengthwise on the body. They are 

 slightly more than half an inch long when full-grown, and move very actively when 

 disturbed. For control, spray with either malathion, carbaryl (Sevin) , or Bacillus 

 thuringiensis . A repeat treatment may be needed in two or three weeks . 



Picnic beetles are beginning to make their presence known around backyard cookouts, 

 picnics, and gardens. These tiny black beetles with four yellow- to- orange spots on 

 their backs are attracted to food odors, and are often uninvited guests in and around 

 the home. The generally wet conditions in May could result in moderate to heavy pop- 

 ulations of this nuisance insect this summer. 



For cookouts, spray the shrubbery and any nearby tall grass or weeds with malathion 

 or diazinon several hours before eating. A space spray of pyrethrins of dichlorvos 

 (DDVP) applied from a pressurized spray can just before eating will provide a quick 

 knockdown of the beetles. 



Sod webworm moths can be observed over lawns, near shrubbery, on window screens, 

 and around lights at night. They are laying eggs for the first -generation larvae, 

 which will feed during late June and early July. This first generation of worms 

 is seldom numerous enough in lawns to cause economic damage, although an occasional 

 lawn may sustain some injury. 



The second-generation of sod webworm that hits in early August causes the big prob- 

 lem. Therefore, chemical control for sod webworms should be applied in August, 

 rather than now. 



Spider mites are attacking some evergreens. Injured evergreens show pale patches. 

 Some branches may be killed. Silken threads or webbing are usually present. To 

 detect these mites, hold a sheet of white paper under a branch and shake the branch 

 vigorously. If mites are present, you will be able to see them moving on the paper. 

 To control spider mites , spray with dicofol (Kelthane) or chloropropylate (Acaralate) . 



WEEDS 



CROP CONDITIONS 



While some parts of the world are concerned about drought, one of our major concerns 

 in Illinois is excessive moisture. Some fields have been "drowned out." Others have 

 been too wet to cultivate, and the weeds are now too big for cultivation or chemical 

 control. Many fields have been replanted, some more than once. 



