INNER CANOPY DEPOSITS OF MICROBIAL SPRAYS IN SOYBEANS1
Elcar® and Coax® suspensions were manually painted on soybean leaves or stems, pods and flowers in the field. Suspension deposits on stems, pods and flowers caused ca 7 × more mortality than deposits on leaves. In a second study, a 1 × suspension deposit on stems, pods and flowers caused approximately the same bioassay mortality (i.e. 58 vs 52%) as a 2 × deposit on soybean leaves. Data from equipment evaluations in the field indicated that a deflector shield mounted immediately in front of the spray boom and positioned to contact the upper 16 – 20 cm of the soybean plants caused higher Heliothis zea (Boddie) mortalities than other treatments evaluated.
Contributor Notes
1 Mention of a Commercial or proprietary product does not constitute a recommendation or endorsement by Mississippi State University or USDA.
2 Agricultural and Biological Engineering Department, Mississippi State University, P. O. Box 5465, Mississippi State, MS 39762 and formerly with USDA ARS at Columbia, MO.
3 Biological Control of Insects Research Laboratory, Research Park, Columbia, MO.