Potato leafhoppers are extremely abundant in soybeans. Damage may appear as brown- 

 ing of the leaf margins and stunted or misshapened appearance of the plants. Rarely 

 is control recommended for these tiny, green, wedge-shaped insects. If damage has 

 become noticeable, however, you may want to control them with malathion, carbaryl, 

 or toxaphene. Control measures for green cloverworms will control these leafhoppers 

 and will add to the benefits derived from cloverworm control. Do not feed toxaphene- 

 treated soybeans as forage to livestock. Do not harvest malathion- treated soybeans 

 for 5 days after treatment. 



Stinkbugs are numerous in some soybean fields, particularly in southern sections. 

 Find a large semielliptical green or brown insect that is shaped somewhat like a 

 shield and smash it. The name indicates the way to identify the bug. These bugs 

 will attack developing pods, sucking the sap from them with their long, stout beaks. 

 They cause shrinking, dimpling, and underdevelopment of the beans; sometimes, pods 

 without any beans. They are also capable of transmitting yeast spot disease. Most 

 farmers usually do not become concerned about stinkbugs until harvest time, when 

 beans are down-graded because of damage. 



USDA research workers have found that an average of 1 stinkbug per yard of row will 

 reduce the yield by 10 percent. If stinkbugs are numerous and control is needed, 

 apply 1 pound of carbaryl (Sevin) or malathion per acre. When using malathion, 

 allow 5 days to elapse between treatment and harvest. 



Livestock Insects 



Fly populations are high on untreated pastured cattle throughout the state. Blood- 

 sucking flies, like the horn fly , are averaging between 300 to 500 per animal in 

 the southern section, 100 to 200 in the central section, and 50 to 150 in the 

 northern section. Stable flies are also present, with an average population of 12 

 per animal. Annoying flies, like the face fly , are highest in the area between 

 route 460 and route 9, where 20 to 40 flies per animal are common. Runny eyes and 

 problems with pink eye and conjuctivitis are noticeable where face flies are abun- 

 dant. Young calves seem to suffer the most. 



For dairy cattle, apply Ciodrin as a 2-percent oil or water-base spray, at 1 to 2 

 ounces per animal, two to four times per week. An automatic sprayer, a small, 

 electric mist-type sprayer (not a f ogger) , or a hand sprayer can be used. Apply 

 the spray over the entire animal, including the legs. Ciodrin is the most effec- 

 tive insecticide for face- fly control; it will also eliminate horn flies and reduce 

 the number of stable flies. 



For beef cattle, the use of an automatic sprayer with Ciodrin as suggested for 

 dairy cattle should be considered. If this is impractical, use a 1-percent Cio- 

 drin, water- diluted spray, at 1 to 2 pints per animal, as often as once a week if 

 needed. Canvas or burlap head oilers and face or back oilers, saturated with a 

 5-percent toxaphene in oil solution, will provide some relief to cattle. Do not 

 treat cattle under 4 months of age with toxaphene, and do not apply it within 28 

 days of slaughter. 



WEED CONTROL 



Where Treflan was applied to soybeans in 1967 , we had several cases of injury to 

 corn earlier in 1968. Some of the injury could be explained by excessive applica- 

 tions, particularly on field ends. In the majority of fields showing injury, soy- 

 bean stubble was not plowed with a moldboard plow prior to planting corn. The 



