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Title: PEANUT SEEDLING RESPONSE TO DINITROANILINE HERBICIDES APPLIED PREPLANT INCORPORATED AND PREEMERGENCE.

Author
item Johnson, Wiley - Carroll
item MULLINIX, JR., B - UNIVERSITY OF GEORGIA

Submitted to: Peanut Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/26/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary: Dinitroaniline herbicides are commonly used on peanut to control annual grasses and small seeded broadleaf weeds. These herbicides are normally applied preplant incorporated (PPI) . Recent research has shown that dinitroaniline herbicides applied preemergence (PRE) are equally efficacious and less injurious to peanut than conventional PPI applications. There were questions concerning the safety of PRE applications to peanut seedlings. Greenhouse studies were conducted in 1995, 1996, and 1998 to determine the effect of PPI and PRE applications of ethalfluralin and pendimethalin, two commonly used dinitroaniline herbicides, on growth of individual peanut seedlings in pots. Rates for each herbicide were 0, 0.6, 1.1, and 2.2 kg ai/ha. Parameters measured were time of emergence, seedling height, canopy width, foliage biomass, root length, and root biomass of individual plants. PPI applications of both herbicides were more injurious than PRE applications for all parameters, even at registered rates. Ethalfluralin PPI inhibited peanut seedling growth more than equivalent rates of pendimethalin PPI. However, peanut seedling response to PRE applications of ethalfluralin and pendimethalin was generally the same. These results are further evidence that dinitroaniline herbicides can be safely applied PRE on peanut, at less cost to the farmer than conventional PPI applications.

Technical Abstract: Greenhouse studies were conducted in 1995, 1996, and 1998 to determine the effect of preplant incorporated (PPI) and preemergence (PRE) applications of ethalfluralin and pendimethalin on growth of individual peanut seedlings in pots. Rates for each herbicide were 0, 0.6, 1.1, and 2.2 kg ai/ha. Parameters measured were time of emergence, seedling height, canopy width, foliage biomass, root length, and root biomass of individual plants. PPI applications of both herbicides were more injurious than PRE applications for all parameters, even at registered rates. Ethalfluralin PPI inhibited peanut seedling growth more than equivalent rates of pendimethalin PPI. However, peanut seedling response to PRE applications of ethalfluralin and pendimethalin was generally the same.