Effects of conditioning, cross-conditioning, and microbial growth on development of enhanced biodegradation of insecticides in soil

Abstract

Pretreatment of a Drummer-Catlin soil mixture with granular formulations of carbofuran or trimethacarb enhanced biodegradation of subsequent treatments with the technical formulations. Degradation of carbofuran was enhanced by pretreatments with trimethacarb, and degradation of trimethacarb was enhanced by pretreatments with carbofuran. Bendiocarb degradation was enhanced by pretreatments of soil with carbofuran or trimethacarb. In bioassays with southern corn rootworm larvae, biological activity of carbofuran, trimethacarb, and bendiocarb was rapidly lost in soils pretreated with granular formulations. Pretreatment of 569

Banana leaf and glucose mineralization and soil organic matter in microhabitats of banana plantations under long‐term pesticide use

“…In the present study, sites managed with herbicides and nematicides and without banana litter from plant harvesting (herbicide, nematicide, and fungicide sites) had a lower addition of organic materials and decreased SOM over time. Lower additions of organic material decrease SOM formation and thus affect negatively biological [17,19,31,32], chemical [36], and physical [12,13,28,29,35] soil properties.…”

“…Microbial adaptation in soil may occur in surface soil under banana cultivation exposed to nematicides , or under other agricultural uses exposed to herbicides and insecticides . In banana farm soil, enriched cultures of 3 bacterial isolates and 1 microbial mat had significant ability to degrade 4 pesticides .…”

“…This low biological availability may demand continuous input of fresh organic materials to maintain adequate microbial activity for nutrient cycling and good soil physical conditions. Microbial adaptation in soil may occur in surface soil under banana cultivation exposed to nematicides [15], or under other agricultural uses exposed to herbicides [16,17] and insecticides [18,19]. In banana farm soil, enriched cultures of 3 bacterial isolates and 1 microbial mat had significant ability to degrade 4 pesticides [20].…”

Isolation and characterization of an N-methylcarbamate insecticide-degrading methylotrophic bacterium

“…This phenomenon reduces pesticide efficacy and causes economic loss (8). Enhanced degradation of pesticides is presumably the result of an increase in the numbers or specific activities of soil pesticide-degrading bacteria (1,14,22,42), but the ecological, physiological, or genetic basis for the adaptation of the microflora is not known. Although in some circumstances carbofuran is subject to accelerated degradation, it is sufficiently mobile in some soils to be considered a potential groundwater and surface water pollutant (32,50,60).…”