-2- 



less than 1 inch long, treatment is not justified in field corn. For control, 

 apply either 1 1/2 pounds per acre of actual carbaryl or toxaphene as granules. 

 Toxaphene should be used only if the corn is to be used as grain; it should not 

 be used on ensilage corn. Do not apply toxaphene to fields adjacent to fish- 

 bearing waters. 



Soybean Insects 



Green cloverworm populations have remained steady during the past week in soybean 

 fields. Some fields in the central section of the state average 3 to 4 worms per 

 foot of row. Early-maturing soybeans will escape yield loss from these worms. 

 These pale-green worms with two thin white stripes along each side strip the 

 leaves but do not damage the pods. After the pods have filled, leaf damage will 

 not affect the yield. If the pods are not filled and there is an average of 6 or 

 more worms per linear foot of drill row, treatment is justified. Use 1 1/2 pounds 

 of toxaphene or 1 pound of carbaryl per acre for control. Do not feed toxaphene- 

 treated forage to dairy animals or livestock fattening for slaughter. Do not ap- 

 ply toxaphene to fields adjacent to fish-bearing waters. 



Grasshopper nymphs have begun migrating from fence rows, ditches, and roadsides 

 into stands of corn, soybeans, hay fields, and pastures. In most instances, pop- 

 ulations are small and control will not be necessary. But as these nymphs mature, 

 they will do more damage. If large numbers of these insects have been observed 

 and are causing damage, especially to pods, they can be controlled with carbaryl 

 (Sevin) , diazinon, malathion, or naled (Dibrom) . 



Homeowner Insect Problems 



Mosquitoes continue to be a nuisance, especially where there have been numerous 

 rains. The following suggestions are repeated: (1) Eliminate standing water in 

 such places as eave troughs, old tires, tin cans, childrens' toys, storm sewers, 

 etc. (2) Apply a water-base spray containing 1-percent malathion (2 ounces of 

 50- to 57-percent liquid emulsion concentrate per gallon of water) to shrubbery 

 and tall grass. Repeat the treatment every week or two if needed. (5) Keep the 

 screens on doors and windows in good repair. (4) Hang plastic resin strips 

 (2" x 10") containing 20-percent dichlorvos (DDVP)--one strip per 1,000 cubic 

 feet of space, or about one per room. These strips will kill mosquitoes and flies 

 for 4 to 6 weeks. As an added precaution, hang the strips where children can't 

 reach them and away from fish bowls and food counters. A 0.1 -percent pyrethrin 

 space spray- -applied from a pressurized spray can- -can be used for quick knockdown 

 in place of the dichlorvos resin strips. Frequent treatments will be needed during 

 problem periods. (5) When entering mosquito- infested areas, use a repellent. One 

 of the most effective mosquito repellents is DEET (diethyltoluamide) . (6) For 

 quick knockdown at cookouts, outdoor parties, or picnics, use either 0.1 -percent 

 pyrethrin or 0.5- to 1-percent dichlorvos (DDVP) as an oil- or water-base space 

 spray. Spray the mist lightly beneath tables and chairs and into the air for a 

 few feet around the area. Repeat the treatment as needed. 



Fall webworms continue to defoliate certain shade trees and shrubs. They can be 

 controlled by spraying with carbaryl. Use 2 tablespoons of the 50-percent wettable 

 powder per gallon of water (2 pounds per 100 gallons) . 



Second-generation elm leaf beetle larvae are defoliating Chinese elms. These 

 second-generation beetles can be controlled with carbaryl, DDT, or lead arsenate. 



