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30YBEAN INSECTS 



grasshoppers continue to damage fields of soybeans and corn. They can also be found in 

 fence rows, ditchbanks, and roadsides, from where they may move to soybeans or corn at 

 any time. If grasshoppers are damaging soybeans or corn, they can be controlled with a 

 spray of 3/4 pound of actual carbaryl (Sevin) or 1-1/2 pounds of actual toxaphene. 

 \llow 21 days between treatment with toxaphene and the harvesting of soybeans for grain. 

 )o not feed toxaphene -treated soybeans or corn as forage to dairy cattle or livestock 

 fattening for slaughter. Carbaryl has no restrictions. For treatment of ditchbanks 

 and roadsides, use one of the same insecticides listed above. It is wise to control 

 grasshoppers in these nonagricultural areas before they have a chance to move into 

 :rop lands. 



iOME OWNER INSECT PROBLEMS 



tystershell scale eggs will be hatching soon in the central section. The young crawlers 

 set up housekeeping on shrubs like lilac and dogwood. They suck the juices from the 

 slant and if abundant, they can seriously retard growth and even kill the plant. This 

 Is the second generation of this scale and the build-up is often heavy. If you have had 

 a history of problems in your yard, spray the shrubs thoroughly with malathion using 

 2 teaspoons of the 50- to 57 -percent liquid concentrate per gallon of water. Target 

 dates for spraying are right now in the southern sections , August 10 in the central 

 section, and August 20 in the northern section. 



Sod webworm moths are increasing in numbers as emergence continues in the central section, 

 rhere are still more to come. These buff -colored moths rest in shrubbery and tall grass 

 luring the day and are seen flying in a zigzag pattern over the lawn near dusk. Second- 

 generation moths are laying their eggs at this time. If you find large numbers of these 

 noths in your yard, plan to treat your lawn with an insecticide about 2 weeks later. 

 Jsually target dates for treatment are now in southern sections, early to mid-August in 

 the central section, and mid- to late August in the northern sections. 



fhe larvae of the webworm are gray worms with brown spots and black heads. They are 

 about an inch long when full grown and live for 3 to 4 weeks in the worm stage. The 

 vorms live in silken-lined burrows in the thatch of the lawn, clipping off grass 

 blades at the base. Brown spots appear in the lawn and large numbers of robins will 

 nove in to feed on the larvae. By this time, it is usually too late for control. 



For control of webworms, apply a spray or granules of 2 pounds of actual carbaryl (Sevin), 

 1 pound of actual diazinon, or 1-1/4 pounds of actual trichlorfon (Dylox) per 10,000 

 square feet. Use about 25 gallons of water to distribute the insecticide over the 10,000 

 square feet when spraying. Do not water the lawn for at least 3 days after treatment. If 

 leavy rains occur within 3 days of application, a repeat treatment may be needed. 



rhere are a large number of mosquitoes in most areas of the state. To reduce the number 

 Df mosquitoes in home yards, follow these steps: (1) Eliminate standing water in such 

 Dlaces 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 

 :oncentrate per gallon of water) to shrubbery and tall grass. Repeat the treatment every 

 reek or two if needed. (3) Keep the screens on doors and windows in good repair. 

 '4) Hang plastic resin strips (2" x 10") containing 20-percent dichlorvos (DDW)--one strip 

 Der 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 cannot 

 reach them and away from fish bowls and food counters. A 0.1 -percent pyre thrum space 

 spray- -applied from a pressurized spray can- -can be used for quick knockdown in place of 



