-4- 



the dichlorvos resin strips. Frequent treatments will be needed during problem periods. 

 (5) When entering mosquito-infested areas, use a repellent. One of the most -effective 

 mosquito repellents is DEET (diethyltoluamide) . (6) For quick knockdown at cookouts, out- 

 door parties, or picnics, use either 0.1-percent pyrethrum or 0.5-percent dichlorvos 

 (DDVP) as an oil- or water-base space spray. Spray the mist lightly beneath tables and 

 chairs and into the air for a few feet around the area. Repeat the treatment as needed. 



WEEDS 



Johnsongrass grows actively with the current moist and warm weather. Now is a good time 

 to treat. If you have Johnsongrass growing in small-grain stubble, in drowned- out bottom- 

 lands, or in idle acres, here is a good control program: 



1. Qiop or clip the Johnsongrass a time or two. This is not essential, but when the tops 

 are cut, food reserves are drawn from the roots and rhizomes, making chemical treat- 

 ment more effective. 



2. Let the Johnsongrass regrow to about a foot high. 



5. Spray with Dowpon. Use 8 pounds of Dowpon commercial product in 30 to 40 gallons of 

 water per acre; 5 pounds may be adequate, though not as effective as 8 pounds. Dowpon: 

 contains a wetting agent, but additional nonionic surfactant or wetting agent may im- 

 prove performance on grass leaves that are difficult to wet. 



4. Wait at least 3 days before disking or plowing. The delay gives Dowpon time to move 

 from the leaves to rhizomes for more complete kill. Then disk or plow. Tillage 

 provides further control. 



5. The area can be planted to corn or soybeans next spring. To control seedling Johnson- 

 grass in corn, use a preemergence herbicide such as Eptam or Sutan. For soybeans, 

 use Treflan, Plana\ r in, or Vernam. 



The above program is one of the best for Johnsongrass control. You can use a similar , 

 program in the spring, but the program is not nearly as practical. You must delay corn 

 and soybean planting at least 5 weeks after applying Dowpon to give the chemical time to 

 decompose. 



Start your quackgrass control program this fall. Five pounds of AAtrex 80W applied at 

 least 3 weeks before freezing usually gives excellent control. We still get many ques- 

 tions on how to control quackgrass after corn is planted. You just can't get good con- 

 trol then. 



So plan ahead with the fall or early spring applications. Dowpon and amitrole-T are 

 other possibilities for quackgrass control. See Illinois Circular 892. 



DISEASES 



Phyllosticta yellow leaf blight has been found recently for the first time in Illinois 

 in the northern tier of counties. This nav disease of corn has been reported in Wis- 

 consin, Michigan, Missouri, Minnesota, Indiana, New York, and Pennsylvania. This disease 

 has so far been found on the earparent in seed production fields, and is not likely to 

 appear in farmers' fields. 



