one or more. Apply the treatment at first egg hatch. Use either 1-1/2 pounds of 

 carbaryl (Sevin) or 1 pound of diazinon as a granule or spray. On whorl -stage 

 corn, aerial applications should be granules, not sprays. Aerial sprays on tas- 

 seled corn are effective. Allow 10 days to elapse before making ensilage or 

 stover when using diazinon. Carbaryl has no waiting period. 



Corn-blotch leaf miners , tunneling between the leaf tissues, were especially 

 noticeable on the lower leaves of corn in some areas this week. The tunnels 

 appear as transparent galleries, and may be confused with corn leaf diseases. 

 By carefully separating the leaf tissue, you can often find a small 1/16- to 1/4- 

 inch, green- to-white maggot or a reddish brown pupa inside. This leaf mining 

 seldom consumes a very large portion of the leaf, and only a few leaves per plant 

 are involved. Damage done by this insect is believed to be of little or no eco- 

 nomic importance. No control is recommended. 



Soybeans 



Green cloverworm populations have increased in soybeans . They strip the leaves 

 but do not attack the pods, as do grasshoppers and bean leaf beetles. Damage is 

 most severe when defoliation occurs while bean pods are filling and while the 

 beans are mature but still green. Moderate defoliation- -less than 40 percent-- 

 occurring before bloom or after the beans are mature will not affect the yield 

 significantly. 



As a rule-of -thumb, we feel that an average of 6 or more worms per linear foot of 

 drill row during the period of pod development justifies treatment. To determine 

 the field average, shake the plants over the center of the row and count the worms 

 in" several places in the field. Use 1-1/2 pounds of toxaphene or 1 pound of 

 carbaryl (Sevin) per acre to control this insect. When using toxaphene, the beans 

 should not be harvested for 21 days after spraying. Do not feed toxaphene- 

 treated soybeans as forage to dairy animals or to livestock being fattened for 

 slaughter. Carbaryl has no waiting period or feeding restrictions. 



Livestock Insects 



Face fly populations continue moderately high on pastured cattle in the central 

 and south-central sections. In the area between Route 460 and Route 9, pastured 

 cattle averaged 20 to 40 flies each. Cattle show annoyance from face flies when 

 10 to 15 flies per animal are present. Cattle on tight, dry- lot confinement are 

 not bothered by face flies. 



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 fogger) , 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, and 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 

 Ciodrin-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. 



