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ARS Home » Research » Publications at this Location » Publication #62561
Title: EFFECTS OF IRRIGATION ON EFFICACY CARRY OVER OF NEMATICIDES IN SOIL PLANTEDTO A SWEET CORN-SQUASH-VETCH CROPPING SYSTEM.

Author
item Johnson, Alva
item Leonard, Ralph
item Wauchope, Robert - Don

Submitted to: Journal of Nematology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/14/1995
Publication Date: N/A
Citation: N/A

Interpretive Summary: Root-knot nematodes are major pests in crop production systems. Treatment with lower rates or less frequent applications of nematicides combined with other nematode management strategies will be a part of future sustainable cropping systems. The effects of irrigation on the efficacy of nematicides (ethylene dibromide, fenamiphos, and aldicarb) against root-knot nematodes and yields of sweet corn and the carry over nematode control on squash wer determined in a sweet corn-squash-vetch cropping system for 3 years. Supplemental sprinkler irrigation applied in addition to natural rainfall within 10 days after application of nematicides did not affect the efficacy against nematodes or yield of sweet corn. Nematicide treatments increased yield of sweet corn and provided carry over control of nematodes on squash planted after sweet corn. Data from this study demonstrate the benefits of utilizing carry over effects in root-knot susceptible crops from a previously treated crop to reduce the use of nematicides.

Technical Abstract: The effects of irrigation on the efficacy of nematicides on Meloidogyne incognita race 1 population densities and yield of sweet corn and the carry over of nematicides on squash were determined in a sweet corn-squash-vetch cropping system for 3 years. Fenamiphos 15G and aldicarb 15G were applied at 6.7 kg a.i./ha and incorporated 15 cm deep with a tractor-mounted rototiller. Ethylene dibromide (EDB) was injected at 18 kg a.i./ha on eac side of the sweet corn rows (total 36 kg a.i./ha) at planting for nematode control. Supplemental sprinkler irrigation (1.52 - 4.45 cm) applied in addition to natural rainfall (4.60 - 10.80 cm) within 10 days after application of nematicides did not affect the efficacy against M. incognita or yield of sweet corn. Soil treatment with fenamiphos, EDB, and aldicarb increased P < 0.05) the number and weight of sweet corn ears and the weight per ear each year over untreated controls. All nematicides provided dsome carry over control of M. incognita on squash planted after sweet corn but yields were consistently greater and root-gall incides lower on squash following sweet corn treated with fenamiphos than other nematicides.