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 

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

 knockdown of the beetles . 



Striped cucumber beetles are numerous in some areas. These black-and-yellow-striped 

 beetles feed upon the new seedlings of squash, cucumbers, melons, and other vine 

 crops as they emerge from the soil. The beetles commonly kill the small seedlings 

 and seriously retard or kill older plants. Carbaryl (Sevin) , used as a dust or 

 spray, will control these beetles. Apply when the beetles first appear and as 

 often as necessary thereafter. Apply late in the day. 



Upcoming Farm Insect Problems 



Grasshoppers are now hatching. Hard, beating rains kill the tiny 'hoppers, but 

 hatch will continue for several weeks and some will survive. We do not expect any 

 severe or widespread grasshopper infestation, but some localized infestations may 

 still be serious. The best time to control grasshoppers is while they are small 

 and still concentrated in their hibernating quarters along roadsides, ditch banks, 

 fence rows, grass waterways, etc. If control becomes necessary, 3/4 pound of car- 

 baryl (Sevin), 1/2 pound of diazinon, or 1 pound of malathion per acre is effec- 

 tive. Toxaphene at 1 1/2 pounds per acre is also effective, but should not be used 

 on dairy farms or adjacent to dairy pastur?s or hay fields. Do not spray toxaphene 

 near fish-bearing waters. Follow time intt-r.'als between application and crop har- 

 vest as listed on labels. 



Corn rootworms will be hatching within the 

 next week or two. If you suspect or know that 

 you have resistant rootworm problems and did 

 not us p a phosphate or carbamate insecticide 

 at planting time, apply it now. Use granules 

 at the base of the plants and incorporate by 

 cultivation. 



Rootworms are likely to be found in fields 

 where com has been grown for 5 years or more 

 in succession. Newly hatched worms are too 

 small to be seen easily. The larvae of root- 

 worms feed on the roots of corn; lodging of 

 corn plants in ir.Ty and August is a typical symptom of damage. 



Corn rootworm larva 

 feeding on root 



As soil insecticides, aldrin and heptachlor have provided excellent protection 

 against rootworms until recently. However, a random survey of rootworm popula- 

 tions in 220 fields in 1966 showed moderate-to-high resistance to these chlori- 

 nated hydrocarbons in about 10 percent of the fields sampled. The primary prob- 

 lem area is in the northern half of Illinois. 



If you have grown corn for several years in succession in the field, if you have 

 used aldrin or heptachlor almost every year, if the corn lodged in August, and 

 if there were lots of green beetles in fresh silks, you probably have resistant 

 northern corn rootworms . 



