-4- 



WEEDS 



Several Illinois vine weeds may start to cause problems about now. Hedge bindweed got a 

 good start in some cornfields, but it is rather easily controlled with 2,4-D. Field 

 bindweed is much more difficult to control. 



Wild sweet potato can be controlled with 2,4-D, but the timing of the application is 

 critical. Use the usual rate of 2,4-D in corn when the sweet potatoes are in the bud 

 stage- -lust before the buds open up into flowers. At that stage, 2,4-D moving toward 

 the tubers with food reserves from the leaves gives the most -complete control. The bud 

 stage may be late enough that high clearance equipment will be needed. 



Wild cucumber control has been relatively good where AAtrex has been applied preemergence, 

 preferably incorporated. As a postemergence treatment, 2,4-D isn't much help. 2,4,5-T 

 controls wild cucumber much better than 2,4-D. 2,4,5-T can be used in fence rows and in 

 noncrop areas, but it does not have federal clearance for use in corn. 



.A nnual morning glories are often controlled in corn with a preemergence herbicide such 

 as AAtrex. Some soybean herbicides like Arniben and Lorox do not give good morning glory 

 control. In corn, 2,4-D postemergence gives good control. In soybeans, postemergence 

 application of 2,4-DB may give fair control where the problem is severe. But before 

 using 2,4-DB on soybeans, consider the risk of injury. If you use 2,4-DB, make careful 

 and accurate applications . 



Cocklebur , although not a vine, is similar to annual morning glory. It is easy to control 

 with 2,4-D in corn. In soybeans, cocklebur control is somewhat erratic with Arniben. 

 2,4-DB can give fairly good cocklebur control in soybeans, but go easy. Use 2,4-DB for 

 only the most-serious problems, and consider the risks before you use it. 



READ THE INSECTICIDE LABEL AND FOLLOW ALL PRECAUTIONS, 



SPECIAL ANNOUNCEMENTS 



Garden Centipede (Symphylan) Research Plot Demonstrational Meeting 



July 9. . .Thomas Watson Farm (Rock Island County). . .9 a.m. 



Go 4-1/2 miles east of the Mississippi River or 4-1/2 miles west of Illinois Cit? 

 on Route 92, then south on the blacktop (County Road B) for 1-1/2 miles and east 

 for 1/4 mile. 



This weekly report was prepared as follows: 



INSECTS: H.B. Petty, Steve Moore, Roscoe Randell, Don Kuhlman, and Stephen Sturgeon, Uni- 

 versity of Illinois College of Agriculture , Urbana-Champaign and Illinois Natural History 

 Survey . 



WEEDS: E.L. Knake, Department of Agronomy 



AG COMMUNICATIONS: Del Dahl. 



The information for this report was gathered by these people, staff members , county Exten- 

 sion advisers, and others, in cooperation with the USDA Agricultural Research Service, 

 Plant Pest Control Branch. 



