FOR IMMEDIATE RELEASE July 3, 1963 



INSECT SURVEY BULLETIN NO. 12 



This is the twelfth in a series of weekly bulletins en the general insect 

 situation in Illinois (fruit insects excepted), prepared "by entomologists of the 

 University of Illinois College of Agriculture, Illinois Natural History Survey and 

 cooperating agencies. It is designed to forewarn people in Illinois of impending 

 changes in insect activity and to suggest abbreviated control measures. These re- 

 ports indicate only general trends. Each individual should check his own fields 

 to determine local conditions. 



Chinch bugs have been migrating from small grains to corn during the past 

 week in central and eastern Illinois. Although not devastating, they have 'oeen nu- 

 merous enough in a few instances to damage marginal rows of corn. In applying 

 dieldrin to control migrating bugs, be sure to treat a strip at least two rods wide 

 into the grain field and as far into the corn field as needed. Do not harvest the 

 grain for one week after application. 



Grasshoppers are hatching in legume fields, and an occasional field has 

 concentrations of 'hoppers. The hot, dry weather is ideal for grasshoppers. Ex- 

 amine second- growth hay fields for these tiny 'hoppers and apply control measures 

 now if they are extremely numerous. 



For pasture and hay fields, use sevin, malathion, dibrom, or diazinon. 

 Follow label directions for rate of application and interval between treatment and 

 harvest. Applications while the second growth is still short and the 'hoppers are 

 still small will enhance control and avoid kill of pollinating insects after bloom 

 has begun. 



Two-spotted mites have been observed on soybeans. This is the same mite 

 that can sometimes be found on evergreens. The feeding appears as a speckling of 

 the leaves. When beans are severely infested, webbing is noticeable. However, the 

 tiny mites are difficult to see unless the leaves are .jarred over a white paper or 

 plate. Control measures have, in general, been inadequate. Furthermore, dry weather 

 favors the development of these mites. 



Black cutworms are reported to be damaging corn in a few isolated instances. 



Wireworms are still being reported from some areas of Illinois. 



General observations ; As fence rows, ditch banks, and other non-crop lands 

 dry up, many insects may migrate from them to cultivated crops. Thus there may be 

 incidental infestations of insects not otherwise found feeding on cultivated crops. 

 It is impossible to predict these unexpected and abnormal infestations. 



Stable flies and horn flies are becoming abundant. Both are bloodsucking 

 flies that rob milk and beef producers of 15 to 20 percent of their profits each 

 summer if allowed to go unchecked. 



For dairy cattle , apply 2.0$ ciodrin, 1.0$ DDVP or 0.1$ pyrethrin in a 

 mineral oil base. Spray at the rate of 1 to 2 ounces per animal per day or as often 

 as needed. Be sure to spray the undersides and legs. 



