Imidacloprid Transport Processes in Florida Sandy Soils Under Saturated Conditions.
Abstract
Imidacloprid (IMD) is a systemic class of neonicotinoid insecticides for the control of Asian citrus psyllids (ACP) in Florida citrus groves. IMD is a very water-soluble organic molecule that has high mobility in sandy soils, and it is weakly adsorbed in the sandy soils of Florida. IMD is easily taken up by plant roots and translocated to the entire plant system, which allow piercing and sucking aphids like ACP to absorb IMD when they feed on the tender leaves. Dominant soil orders for cultivating citrus are Entisols and Ultisols in central Florida. They are well-drained and sandy in texture and are called central Ridge soils. The difference between the soil orders is the presence of Bt horizon, that is, illuviated accumulation of clay mineral in the subsurface layer. These soils are different from those on the Flatwoods regions and may have different nutrient and pesticide sorption/transport behavior due to absence of spodic or argillic layer in the top 1 m from the soil surface. The aim of this study is to understand the transport processes of imidacloprid in a packed column of Ultisol and Entisol under saturated conditions. In this study, times of mitigating citrus greening disease where growers are seeking for more application rates of insecticides to mitigate yield quantity and quality in a soil type of this nature (well-drained, and sandy in texture, with very low organic matter <1.0%), we should be concerned with groundwater water contamination and pollution.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2022
- Bibcode:
- 2022AGUFM.H15I0906U