_//-?/ 



COLLEGE OF 

 AGRICULTURE 

 UNIVERSITY OF 

 ILLINOIS AT 

 URBANA-CHAMPAIGN 

 AND NATURAL 

 HISTORY SURVEY 

 URBANA. ILLINOIS 



NSECT WEED & PLANT DISEASE SURVEY BULLETIN 



TATE/COUNTY/LOCAL GROUPS/US. DEPARTMEMT OF AGRICULTURE COOPERATING 



OR IMMEDIATE RELEASE 



No. 2, April 10, 1970 



'his series of weekly bulletins provides a general look at the insect, weed, and plant 

 lisease situation (fruit and commercial vegetables excepted) , along with, suggested, ab- 

 breviated control measures. Each individual should check his own fields to determine 



■ocal conditions, 



■OR AGE INSECTS 



INSECTS 



THE LIBRARY OF THE 



JUN 1 8 1970 



UNIVERSITY Of ILLINOIS 

 *$ URBANA-CHAMPAIGN. 



Ifalfa weevil eggs began to hatch this past weekend with the warm weather, but cool 

 eather could bring weevil development to a stand still. Populations of this pest will 

 ary greatly from area to area, even from field to field. No statement can be made that 

 ill apply to all fields in any one area. A few noticeably damaged fields may be pre- 

 ent as far north as Kankakee on the east and Pittsfield on the west. However, the more- 

 evere and general infestations, as expected, will be in the southern part of Illinois. 



.mall larvae can now be found in the southern part of the state, but feeding at present 

 s minor and almost unnoticeable. Mien 25 percent of the tips show feeding, apply an 

 nsecticide unless the crop is within 10 days of harvest. Treatments may be needed at 

 he earliest in a week to 10 days in extreme southern sections, in about 10 days to 2 

 eeks in the south central section, and in 2 to 4 weeks in the central section. 



he insecticide recommendations are: 



Commercial applicators . Apply 1/2 pound per acre of methyl parathion or azinphosmethyl 

 (Guthion) for good results. Use azinphosmethyl only once per cutting. Do not harvest 

 for 15 days after treatment with methyl parathion, or 16 days for azinphosmethyl. Wear 

 protective clothing. 



. Persons not equipped with protective clothing . Use (1) Imidan at 1 pound per acre, 

 (2) a mixture of 3/4 pound of malathion and 5/4 pound of methoxychlor per acre, (5) a 

 mixture containing at least 1/2 pound of diazinon and 1 pound of methoxychlor per acre, 

 or (4) 1-1/4 pounds of malathion per acre on days when air temperatures will be above 

 60° F. for several hours after application. Do not harvest for 7 days after treatment 

 with Imidan, methoxychlor, diazinon, or mixtures of them. There is no waiting period 

 for malathion. Do not apply Imidan more than once per cutting. 



lover leaf weevils are green worms with a white stripe down the back . They resemble 

 Ifalfa weevils. They often feed on red clover, however, and do feed at night- -hiding in 

 ail debris during the day. Clover can usually grow away from damage; but if growth is 

 low and leaf feeding is severe, a spray of 1 pound of malathion per acre (or mixtures of 

 alathion or diazinon and methoxychlor) will reduce the insect population and allow the 

 Lants to grow. Malathion alone is most effective when air temperatures are 60° F. or 

 Dove. 



