Allow 15 days to elapse between an application of methyl parathion and harvest, 

 16 days for azinphosmethyl, 7 days with methoxychlor , and 7 days with diazinon. 

 No interval is required between the application of malathion and harvest. 



We are continually questioned about the most effective material. Methyl para- 

 thion, put on by commercial applicators who wear protective clothing, usually 

 provides the best control under all conditions. Furthermore, the total cost of 

 chemical and application may not be any greater than chemical cost plus labor 

 for the materials used by the individual applicator. Regardless of what material 

 is applied or how, timing is critical. An application made too early may be 

 wasted, but an application that is too late usually means a crop loss. Apply 

 when 25 percent of the terminal growth shows feeding damage. 



The quantity of finished spray applied per acre is also important. Use no less 

 than 4 gallons per acre by air or 20 gallons per acre by ground machine. The 

 exception is on stubble, where 10 gallons per acre by ground will be sufficient. 



White grubs will probably be present in some fields this spring, especially in 

 the east-central part of the state where they were a problem in 1965 (when ap- 

 proximately 20 thousand acres of soybeans were damaged) . These U-shaped larvae 

 with a brown head have been overwintering down in the soil, after hatching from 

 eggs this past fall, and are now near the surface. One species of white grub or 

 June beetles commonly lays its eggs in soybean fields. True white grubs usually 

 complete their life cycle in 3 years, spending almost 2 years in the soil as grubs. 

 This insect feeds on the roots of both corn and soybeans. One indication that this 

 pest is present in a field is that they will be turned up to the surface during 

 plowing. If many birds are feeding on freshly plowed or disced ground, check to 

 see if there are white grubs present. If the field is to be planted to corn, 

 broadcast 3 pounds of actual aldrin or heptachlor per acre and incorporate it 

 into the soil. Do not use these chemicals on fields to be planted in soybeans. 

 Ahead of soybeans, broadcast 4 pounds of actual diazinon per acre and incorporate 

 it into the soil. 



White grubs and other soil infesting insects in the home garden can be controlled 

 with a broadcast application of diazinon. Apply 1 ounce of actual diazinon per 

 1,000 square feet of garden area and work it into the soil. Do not apply aldrin 

 or heptachlor to home garden soil . 



Spring cankerworms will be hatching soon and will be feeding on many deciduous 

 trees, such as American elms and apple. These brown to dark-green to black mea- 

 suring worms (sometimes called inch-worms) can completely defoliate trees in the 

 early spring as the trees leaf out. For best control results, apply the chemical 

 when the worms are still small. Use either carbaryl (Sevin) with 2 pounds of 50- 

 percent wettable powder in 100 gallons of water or lead arsenate with 4 pounds 

 per 100 gallons of water. 



Clover mites are annoying in some homes. These mites are tiny, orange-to-black 

 moving specks about the size of the period at the end of this sentence. They 

 cover furniture, walls, curtains, window sills, etc., as they attempt to find 

 their way outdoors. Pick them up with a vacuum cleaner or use an 0.1-percent 

 pyrethrin spray from a pressurized spray can for quick knockdown. Before fall, 

 remove grass, clover, and weeds next to the foundation- -leaving a strip of soil 



