Influence of metalaxyl fungicide seed treatment on severity of rootworm (Diabrotica spp.) damage to corn (Zea mays) under no-tillage conditions

Wayne L. Pedersen, James D. Kline, Carl Bradley, Daren S. Mueller

Research output: Contribution to journalArticlepeer-review

Abstract

Fungicide seed treatments and soil insecticides were used in no-till fields to improve plant stand, decrease corn rootworm injury ratings, and increase yields in a 2-year study at two locations in Illinois. Throughout the study, the addition of the insecticide chlorpyrifos consistently decreased corn rootworm injury ratings. The fungicide seed treatment metalaxyl significantly decreased plant stand loss and reduced the number of stunted plants. The addition of metalaxyl to captan as a seed treatment significantly (P≤0.05) reduced the rootworm injury ratings compared to captan alone in three of eight comparisons when chlorpyrifos was not applied for rootworm control. In the absence of chlorpyrifos, metalaxyl never reduced rootworm injury ratings below a 3.0. For this reason, metalaxyl should not be considered as an alternative to insecticides for rootworm control, but should be recognized by corn breeders and others as having a possible effect on a hybrid or inbred's susceptibility to rootworms.

Original languageEnglish (US)
Pages (from-to)647-652
Number of pages6
JournalCrop Protection
Volume22
Issue number4
DOIs
StatePublished - May 2003

Keywords

  • Chlorpyrifos
  • Corn
  • Diabrotica
  • Insecticide
  • Maize
  • Metalaxyl
  • No-till
  • Pythium
  • Rootworm
  • Seed treatment
  • Zea mays

ASJC Scopus subject areas

  • Agronomy and Crop Science

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