Efficacy of drip irrigation with thiamethoxam on control of Monolepta hieroglyphica, and uptake, translocation and dietary risk of thiamethoxam in maize

Abstract

BACKGROUNDMonolepta hieroglyphica (Motschulsky) is an important agricultural pest that causes significant economic losses in terms of crop production. Conventional pesticide spraying treatments can result in pesticide drift, endanger nontarget organisms, and cause pests to fly away, resulting in unsatisfactory prevention and control effects. To study the effect of thiamethoxam on the control of maize M. hieroglyphica, a field experiment was conducted to determine the optimal thiamethoxam application dose, its spatial and temporal distribution dynamics and its dietary risk based on its control effect when applied by spray and drip irrigation.RESULTSThe results of the field trials showed that compared with spray irrigation, drip irrigation resulted in greater control starting from the 5th day. This result was due to the hysteresis effect of thiamethoxam being first absorbed by the roots and then continuously transferred upward, where it accumulates. After 30 days of drip irrigation with 75 and 150 g a.i. ha‐1 thiamethoxam, the control effect on M. hieroglyphica was 32.41‐49.44% and 69.77‐80.57%, respectively. The results of the dietary risk assessment showed that the risk of thiamethoxam ingestion through maize kernels was acceptable regarding its effect on human health.CONCLUSIONSDrip irrigation with thiamethoxam can improve the effective utilization rate of pesticides, achieve precise control of maize M. hieroglyphica, and provide a new method for sustainable agricultural production.This article is protected by copyright. All rights reserved.

The Amino Acid Transporter PtCAT7 and Ammonium Nutrition Enhance the Uptake of Thiamethoxam in Citrus Rootstock Seedlings

“…Systemic insecticides are deposited in soil around plants via soil irrigation, and then they are continuously absorbed by the root system and translocated to the aboveground part of the plant, thus providing long-lasting protection. For example, through using drip irrigation, chlorantraniliprole provided longer control efficacy against Spodoptera frugiperda than artificial or drone spray, and thiamethoxam (THX) effectively controlled Monolepta hieroglyphica for 30 days and significantly reduced the ACP population for three months. , ACP prefers to colonize or feed on fresh shoots, so its population density is closely related with flushes. Citrus trees produce multiple flushes within a year, such as in early spring, early summer, late summer, fall, and winter, coinciding with peak populations of ACP.…”