Dl. Kunkel et al., SAFENERS REDUCE CORN (ZEA-MAYS) CHLOROACETANILIDE AND DICAMBA INJURY UNDER DIFFERENT SOIL TEMPERATURES, Weed technology, 10(1), 1996, pp. 115-120
The results of two experiments involving the effects of safeners on ch
loroacetanilide and dicamba injury in corn are reported here. The firs
t experiment was conducted to determine whether MON-4660, CGA-154281,
dichlormid, and MON-13900 would increase corn tolerance to alachlor, m
etolachlor, and acetochlor, respectively, over a range of soil tempera
tures (12 to 37 C). All three herbicides, particularly acetochlor, red
uced corn shoot lengths at temperatures less than 32 C, The safeners e
ffectively increased corn tolerance to their respective chloroacetanil
ide herbicide at all soil temperatures. However, acetochlor injury was
not completely overcome by dichlormid or MON-13900 when temperatures
were less than 27 C. The second experiment was conducted to determine
whether these safeners would alleviate injury caused by chloroacetanil
ides applied with dicamba in sensitive (Pioneer 3320) and tolerant (Ca
rgill 7567) corn hybrids at soil temperatures ranging from 17 to 27 C.
Chloroacetanilides (4.5 kg ai/ha) plus dicamba (0.6 kg ae/ha) reduced
shoot lengths in both hybrids, with acetochlor/dicamba combinations c
ausing the greatest reductions. All four safeners increased corn toler
ance to chloroacetanilide/dicamba tank-mixtures equally.