Effect of dimethoate in controlling Monolepta hieroglyphica (Motschulsky) and its distribution in maize by drip irrigation.

BACKGROUND Monolepta hieroglyphica (Motschulsky) is a primary pest of maize. The effect of dimethoate on controlling the infestation of M. hieroglyphica was studied by drip irrigation. Field trials were conducted to determine the most effective rate and water volume of dimethoate treatment in arid and semi-arid areas. The absorption, distribution, and dissipation of dimethoate in maize and soil were examined. RESULTS Field trials showed that dimethoate with a rate of 2.70 kg a.i. ha-1 and water volume of 200 m3 ha-1 was the most effective treatment for controlling M. hieroglyphica. Dimethoate via drip irrigation showed longer persistence than artificial spraying and unmanned air vehicle spraying. Different parts of maize induced a hysteresis effect on dimethoate absorption. Dimethoate was absorbed from the roots, transported upward, and enriched in the leaf. Dimethoate was mainly concentrated within a certain range near the emitter after drip irrigation. The terminal residues of dimethoate in maize grain were below detectable levels 42 days after treatment. CONCLUSIONS Dimethoate treatment via drip irrigation can control infestation of M. hieroglyphica on maize. Results showed that dimethoate is safe for maize and the environment. This study provides guidance for the application of pesticides in arid and semi-arid areas. This article is protected by copyright. All rights reserved.

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