-2- 



Over half of the plants cut off above the growing point will live; plants 

 cut off "below the growing point will die. If post-planting treatment is needed, 

 use either l/2 pound of actual dieldrin or 3 pounds of actual toxaphene. Concen- 

 trate the spray as a "band at the "base of the plants. The more water you use per 

 acre, the "better the results will "be. If possible, cultivate immediately to cover 

 the spray deposit. Do not use dieldrin or toxaphene on dairy farms or allow the 

 drift to reach dairy pastures or hay crops. For dairy farms, use 2 pounds of actual 

 carbaryl per acre. It will not "be as effective as diedrin or toxaphene, hut it 

 should he of some help in controlling cutworms. 



Chinch hug nymphs can he found in thin stands of grain in a few east- 

 central Illinois areas as far north as Joliet. They can also he found occasionally 

 in cornfields where grain or grass was plowed down just before the corn was planted. 

 So far these infestations are limited to areas where there has been comparatively 

 little rain during the past weeks. 



If migration from small grain to corn appears imminent, you can apply 

 l/2 pound of dieldrin per acre as a barrier treatment. Apply it to a strip two 

 rods into the grain and the same distance into the corn just as migration begins. 

 Do not apply within one week of harvest. 



Dairy farmers should not use diedrin but might try one pound of carbaryl 

 per acre on the corn. Direct the spray to the bottom half of the plants. Repeat 

 applications may be needed during migration. The results will not be so satisfactory 

 with carbaryl as with dieldrin. 



Grape colaspis larvae are the small comma-shaped grubs often found on 

 corn planted after clover or lespedeza. These worms eat the roots, causing the 

 corn leaves to turn purple, a phosphate deficiency symptom. Damage has appeared 

 on occasiont.1 fields this year; the larvae are almost full-grown, and plants should 

 soon be growing away from the effects of this root pruning. 



White grubs eating the roots of corn present an even more difficult con- 

 trol problem than the black cutworm. If you want to atter.pt control, apply 2 to 3 

 pounds of aldrin or heptachlor as a spray directly to the base of the corn plants. 

 Cultivate immediately, throwing dirt up around the plants. This treatment will be 

 only partly effective, b-t it may kill enough grubs to prevent severe damage and 

 thus allow the plants to partly recuperate. 



Grasshoppers are now hatching. Hard, beating rains kill the tiny 

 'hoppers, but hatch will continue for about three more weeks and some undoubtedly 

 will survive. 



Although we are not expecting any severe or widespread grasshopper infesta- 

 tion, we know that some localized infestations may be severe. Since grasshoppers 

 are usually concentrated in these small spots, they can be easily controlled now 

 with a minimum amount of insecticide. If you observe high concentrations of small 

 'hoppers, apply 3/U pound of carbaryl, l/2 pound of diazinon, 1 pound of malathion 

 or 3/^ pound of naled per acre. Follow time intervals between application and crop 

 harvest as listed on labels. 



Seed corn maggots have been reported from one field of soybeans. This 



maggot drills into the bean seed or into the tender sprout. Damage is most 



noticeable when corn or soybeans germinate slowly. It is usually too late for con- 

 trol by the time it is discovered. 



