5. Fields that are close to harvest and in which treatment is necessary should not be 



treated with azinphosmethyl (at least 16 days before cutting) or with methyl parathion 

 (15 days). Switch to one of the other suggested chemicals, such as malathion, that 

 has no waiting period. 



Use no less than 4 gallons of finished spray per acre by air, or 20 gallons per acre if 

 ground equipment is used. On stubble, 10 gallons per acre is sufficient. 



Special note : Some spray burn was noticed this week, but the burn was not serious enough 

 to affect yield. The burn appears 2 to 3 days after spraying as yellow spots on the leavt, 



Spittlebug froth masses are numerous in many new seedings of clover and alfalfa, particula: 

 in the northern and western sections. If there are 1 or more nymphs per stem, control is 

 profitable. It is best to control the nymphs while they are still small and just begin- 

 ning to form the froth masses. For control, apply methoxychlor at 3/4 pound of actual 

 chemical per acre. With methoxychlor, allow one week to elapse between treatment and 

 harvest or pasturing. 



Potato leafhoppers continue to migrate into the state from the south. These tiny, green, 

 wedged-shaped insects that skid sideways when disturbed cause a yellowing of the second- 

 and third-crop alfalfa. No control measures are needed at this time. 



CORN INSECTS 



European corn-borer pupation is well along in the southern section of Illinois, and a few 

 moths have emerged. Pupation is just beginning in the central section. Reports on corn- 

 borer development were received this week from Stan Ceglinski at Mounds, Earl Lutz at 

 Ridgway, Warren Bundy at Edwardsville, and Jim Paullus at Rochelle. First-generation corn 

 borers now have the potential of seriously damaging corn in the northern half to two- 

 thirds of the state. Planting got well under way during the last few days of April and 

 the first week of May in this area. Rain has since prevented further planting. Corn- 

 borer moths will concentrate their egg-laying in these more mature fields (corn, which is 

 now up) during the month of June. Watch these fields closely in June for borer infesta- 

 tions. Be prepared to use insecticides if needed. 



High overwintering borer populations exist. Thus far, the borers are healthy, although 

 strong winds and beating rains during peak moth flights could still eliminate the threat. 



Seed-corn beetles continue to pose a serious threat for germinating corn. The new 

 suggestion of using a diazinon seed treatment for protection has presented some problems 

 with seeding rates for farmers . The treatment has not affected germination . The earlier 

 reports that diazinon dust adversely affected seeding rates have been traced largely to 

 the use of the dust during periods of high humidity. This was our suspicion when we first 

 commented on this problem two weeks ago. Generally speaking, farmers who have taken the 

 time to check and clean their planter plates frequently have had little difficulty. We 

 still feel that the use of a diazinon seed treatment is good practice. Some of the farmers 

 who have returned their supply of diazinon dust to their dealers may regret this later on. 



Black cutworm moths have been flying for several weeks, but there has been no damage re- 

 ported as yet. Cool wet weather favors this insect. Watch low, wet spots or poorly 

 drained spots in cornfields for damage. Broadcast applications of aldrin or heptachlor 

 at or before planting (not for use on dairy farms) have given the most -cons is tent pro- 

 tection against this insect. If damage appears, use a spray- -directed at the base of the 

 plants --of carbaryl (Sevin) at 2 or 3 pounds, diazinon at 2 pounds, toxaphene at 5 pounds, 



