SOYBEAN INSECTS 



Two- spotted mit es were a problem on soybeans and com in some areas during 1971, pre- 

 ceded by a period" of dry weather locally. These tiny pests can be found on the bot- 

 tom side of soybean leaves. They rasp the leaf and feed in the exuding plant juices. 

 This gives the leaf a speckled appearance. If two-spotted mites are extremely abun- 

 dant, there will be a webbing on the leaves. The tiny dots on the webbing are the 

 mites. By the time webbing can be seen, the leaves will have a distinct speckled 

 white appearance and may even be yellow or brown. 



Control is difficult because sprays must hit the undersides of the leaves and must 

 penetrate the webbing, if it is present. Place drop nozzles between the rows and aim 

 them toward the rows, pointing upward at a 4 5 -degree angle. Note: The operator should 

 wear protective clothing and a v oid spray drift when using this nozzle arrangement . 

 Use 1/2 pound of azinphosmethyl (Gutnion) or 3/4 pound of carbophenothion (Trithion) 

 per acre to control the mites. These should be applied by experienced commercial ap - 

 plicators only . Wait 21 days with azinphosmethyl and 7 days for carbophenothion be- 

 tween treatment and harvest. Do not feed treated soybeans as forage to livestock. 



FORAGE CROP INSECTS 



Grasshoppers have not disappeared, so keep an eye on them. Use one of the grasshop- 

 per insecticides, such as carbaryl or malathion. For roadside spraying, you can use 

 toxaphene, except near fish -bearing waters. Do not feed forage treated with toxaphene [ 

 to livestock being fattened for slaughter, to dairy animals, or to poultry. 



SMALL GRAIN INSECTS I 



Cereal leaf beetles can now be found in practically all counties around the state- - 

 despite effective control programs with chemicals and the quarantine of certain ag- 

 ricultural commodities, which greatly delayed the spread of this pest in Illinois. 

 Because of this year's new infestations, Director Gordon Ropp of the Illinois Depart- ij 

 ment of Agriculture announced this week that the county-by-county, cereal leaf beetle 

 quarantine had been lifted. Shipments of regulated agricultural commodities can now 

 move freely from county to county, but the movement of such commodities westward into 

 nonregulated areas will require certification by the USDA. 



LIVESTOCK INSECTS 



Pasture flies continue to increase on cattle. Face flies, horn flies, and stable flies 

 reduce milk flow and beef production. Control programs should be started immediately. 



For dairy cattle, apply crotoxyphos (Ciodrin) as a 2 -percent oil or water base spray 

 at the rate of 1 to 2 ounces per animal, two to four times a week. Crotoxyphos as a 

 1-percent, water-diluted spray applied at 1 to 2 pints per animal, as often as once a 

 week, is also effective. In addition, a 1-percent dichlorvos (DDVP) or a 0.1-percent 

 pyrethrum spray, applied at 1 to 2 ounces per animal each day, can be used. Pay par- 

 ticular attention to the animals' legs and undersides when spraying. Ciodrin is the 

 most effective insecticide for face fly control . All of the above insecticides pro- 

 vide good control of barn flies and fair control of stable flies. 



For beef cattle, apply a water-base spray of 0.5 -percent toxaphene at the rate of 1 

 to 2 quarts per animal every three weeks. Toxaphene provides excellent control of 

 barn flies, fair control of stable flies, and poor control of face flies. If the face I 

 flies become a serious problem, use crotoxyphos (Ciodrin) as suggested for dairy 



