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Title: CONTROL OF TRIAZINE-RESISTANT SMOOTH PIGWEED IN CONTINUOUS NO-TILL IMIDAZOLINONE RESISTANT CORN

Author
item HINES, RON - UNIV OF ILLINOIS
item WAX, LOYD

Submitted to: North Central Weed Science Society US Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 7/29/1996
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Corn is often grown continuously in no-till systems on erosive lands in southern Illinois, Indiana, and Kentucky. Weed control on these areas has involved extensive use of the triazine herbicides, and biotypes of weeds resistant to the triazines have evolved in some of these fields. We conducted studies over three years on producers fields infested with a triazine-resistant biotype of smooth pigweed to assess the problem and develop improved management strategies. Various herbicides, were evaluated alone, in tank-mix combinations and as sequential applications. No triazine herbicides were effective in controlling the smooth pigweed present. Due to the repeated failures to control pigweed in the past, enormous numbers of pigweed seedlings emerged, with repeated flushes of germination. As a result, the most effective treatments were sequential applications of non-triazine herbicides, that included growth regulators such as dicamba and 2,4-D and several of the ALS inhibitors such as nicosulfuron, primisulfuron, and imazethapyr. Treatments could also be improved with spot treatments and occasional cultivation with special types of cultivation devices, where the fields were not especially erosive.