Mimosa webworms are pale gray-to-brown worms that have five white stripes running 

 lengthwise on the body. They feed on the leaves of mimosa, locust, and similar 

 species. These worms web the leaves together to form a nest. They feed inside this 

 enclosure, skeletonizing the leaflets. In about two weeks, Mimosa webworms will be 

 dropping from the trees on their webs. For control, spray soon with malathion, car- 

 baryl (Sevin) , or Bacillus thuringiensis . A repeat treatment may be needed in two or 

 three weeks. 



Aphids can be found on many trees and shrubs . This week they were observed commonly 

 on tulip trees. These small, soft-bodied, light-green insects suck the sap from 

 plants and secrete a sticky material called "honeydew." This sugary material coats 

 the leaves, making them glisten. A black mold may develop when the honeydew deposits 

 are heavy. Cars parked beneath infested trees will become covered with sticky spots. 



Ants feed on the sugary secretions of aphids. Thus, the presence of a large number 

 of ants on a plant may be a sign that aphids are numerous too. Various species of 

 flies also are attracted to this secretion. Lady beetle adults and larvae are also 

 present and are eating the aphids . The white specks on the leaves are the cast skins 

 of the aphids. In most cases, aphids or plant lice do little damage. However, if 

 leaves begin to curl, turn yellow to brown, and then dry, apply a spray using 2 tea- 

 spoons of a 50- to 57-percent malathion or a 25-percent diazinon liquid concentrate 

 per gallon of water. Do not use malathion on African violets or canaert red cedar. 

 Do not use diazinon on ferns or hibiscus plants . 



FIELD MEETING ON CORN R00TW0RM CONTROL 



We will be evaluating the performance of various soil insecticides for controlling 

 corn rootworms at research plots on July 11, 12, and 13 at the Harold Gardner farm, 

 Coldbrook, and the demonstration performance plots on July 16 and 17 in Henderson 

 County at the James Darrah farm. Your help to evaluate the old and the new will be 

 appreciated. You will see the first-hand results of roo two rm- control tests with var- 

 ious soil insecticides to be recommended for 1974. 



July 11, 12, and 13 . . . .8:00 a.m. . . .The test field is located just west of the 



Holiday Inn sign on the Harold Gardner farm 

 at Coldbrook on Route 34 between Galesburg 

 and Monmouth, Illinois. 



July 16 1:00 p.m. . . .Henderson County. The James Darrah farm. 



Go three miles north of Junction 164 and 94 

 and three miles east. We will be taking 

 "root ratings" and making "pull tests" on 

 this day. Call Curt Eisenmayer, Henderson 

 County Extension Adviser in Stronghurst, for 

 further information. Telephone: (309) 

 924-4071 



July 17 9:00 a.m. . . .Same location as above. We will be making 



larval counts. Bring a pocket knife for ex- 

 amining roots. 



