AI Article Synopsis
- The study investigated how azadirachtoids degrade on tomatoes after being treated in a greenhouse, using 1 and 5 times the manufacturer's recommended concentration.
- Results showed that the levels of azadirachtin A (AZA-A) remained below the maximum residue level (MRL), with a calculated half-life of 1.2 days, consistent with a preharvest interval (PHI) of 3 days.
- Photodegradation due to sunlight was found to be the primary factor in the breakdown of AZA-A, while the waxy coating on tomatoes enhanced this degradation rate in the commercial formulation.
Article Abstract
The degradation of the main azadirachtoids on tomatoes was studied after greenhouse treatment. These experiments were carried out at 1 and 5x the concentration recommended by the manufacturer. In all experiments the deposition of azadirachtin A (AZA-A) was below the maximum residue level (MRL). Even if at the highest dose, AZA-A half-life time calculated as pseudo first order kinetic was 1.2 days in agreement with the recommended preharvest interval (PHI) of 3 days. Experiments with a model system showed that sunlight photodegradation is the main factor influencing the rate of disappearance of AZA-A after greenhouse treatment while tomato epicuticular waxes doubled the photodegradation rate of AZA-A in a commercial formulation.
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| http://dx.doi.org/10.1080/10934520902784641 | DOI Listing |
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