Sunlight photodegradation is one of the most destructive pathways for pesticides after their release into the environment. Plant surfaces, especially leaf surfaces, are the first reaction environment for a pesticide molecule after application, and spray drift would indirectly present a similar situation. Photolysis on soil surfaces becomes important when a pesticide is directly applied to soil or not significantly intercepted by plants, providing that the leaf cover does not shade the ground from sunlight. Because the foliar interception of pesticides depends on plant species and usually increases with their growth stage (Linders et al. 2000), the importance of soil photolysis is considered to be lessened when plants become mature. Spray drift after pesticide application or washoff from plants by rain is the indirect route by which a pesticide reaches the soil.

https://bilder.buecher.de/zusatz/14/14812/14812358_lese_1.pdf?origin=publication_detail

Photodegradation of Pesticides on Plant and Soil Surfaces

In this paper we present a broad overview of the class of insecticides known as synthetic pyrethroids. The discussion includes a summary of agricultural and urban pyrethroid use patterns and trends, pyrethroid chemical structure and properties, the significance of photostability to pyrethroid environmental fate, and hydrophobicity, persistence and relative aquatic toxicity as compared to other pesticides. Finally we provide a brief summary of California's regulatory response to recent detections of pyrethroids in aquatic sediments and a discussion of scientific and regulatory issues associated with ongoing pyrethroid aquatic exposure assessments and mitigation efforts.

Synthetic Pyrethroid Use Patterns, Properties, and Environmental Effects

Improved understanding of the factors determining the insecticidal activity, the mammalian toxicity, and the stability in air and light of natural and synthetic pyrethroids has led to a series of n

Properties and applications of pyrethroids.

The toxicity of natural pyrethrins and five pyrethroids was determined with coho salmon (Oncorhynchus kisutch), steelhead trout (Salmo gairdneri), fathead minnow (Pimephales promelas), channel catfish (Ictalurus punctatus), bluegill (Lepomis macrochirus), and yellow perch (Perca flavescens) The 96-hour LC50's in static tests at 12‡C ranged from 246 to 114Μg/1 of natural pyrethrins and from 0110 to 1,140Μg/1 of pyrethroids Two pyrethroids, RU-11679 and SBP-1382(R), were over 10 times more toxic than pyrethrum extract in the flow-through tests Coldwater species of fish were more sensitive than warmwater species to all the compounds Temperature (12–22‡C) influences the toxicity of natural pyrethrin and the pyrethroids The natural pyrethrin was more toxic to fish in pH 65 than in pH 95 water, but the toxicity of pyrethroids was not influenced in that pH range The two most toxic pyrethroids, RU-11679 and SBP-1382, were deactivated more rapidly in water solutions than natural pyrethrins, S-bioallethrin, dimethrin, andd-trans allethrin

Toxicity of natural pyrethrins and five pyrethroids to fish

Chapter 1 – THE PHYSIOLOGY OF INSECTICIDE RESISTANCE BY INSECTS

Photodecomposition of pyrethrin I, allethrin, phthalthrin, and dimethrin modifications in the acid moiety.

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Photodecomposition of pyrethrin I, allethrin, phthalthrin, and dimethrin modifications in the acid moiety.