The residue property of fungicide boscalid and fluidioxonil at the same time harvest leafy-vegetables

Abstract

In order to use in the classification of minor crop for the mutual application of safe use guideline, it was investigated the residue property of fungicide boscalid and fludioxonil at the same time harvest leafy-vegetables, such as spinach, ulgaribaechu, vitaminchae and cheongkyungchae. After pesticides were applied 2 times with 1 week interval in that day of harvest, 2 days, 5 days and 7 days before harvest, vegetables were harvested, and the residue of pesticides was investigated. Base on the residue in that day of harvest, the deposit of spray solution in vegetables was calculated. The deposit of spray solution of boscalid was 253.9 mL/kg in spinach, 83.0 mL/kg in ulgaribaechu, 97.8 mL/kg in vitaminchae, and 88.3 mL/kg in cheongkyungchae, respectively. In case of fludioxonil, it was calculated 157.6 mL/kg in spinach, 67.6 mL/kg in ulgaribaechu, 64.8 mL/kg in vitaminchae, and 66.6 mL/kg in cheongkyungchae, respectively. When the amount of the deposit of both pesticides was compared in leafy-vegetables, it was the highest in the spinach. On the other hand, it was estimated the predicted dissipation curve of pesticides in leafy-vegetables during cultivation. The half-life of boscalid was 5.9 days in spinach, 7.4 days in ulgaribaechu, 4.6 days in vitaminchae, and 4.3 days in cheongkyungchae, respectively. Also, it was estimated half-life in fludioxonil, it was 3.0 days in spinach, 4.0 days in ulgaribaechu, 3.2 days in vitaminchae, and 3.5 days in cheongkyungchae, respectively. The half-life was the longest in the ulgaribaechu. When both pesticides were compared with the residue property, the deposit of spray solution and half-life of dissipation of boscalid were more than those of fludioxonil.

Dissipation and Distribution of Picarbutrazox Residue Following Spraying with an Unmanned Aerial Vehicle on Chinese Cabbage (Brassica campestris var. pekinensis)

“…The half-life was approximately 17 days, as determined using a first-order kinetic model; it was longer than the biological half-life. This result showed that the concentration of residual pesticides decreases as Chinese cabbage grows; a similar result was also reported through a linear regression curve for the dissipation of pesticide residues sprayed on cabbage [ 36 ]. Excluding the dilution effect, the residues were 0.265 and 0.131 mg kg −1 at 0 and 14 days after the last spraying, respectively, and the equation for the dissipation curve was y = 0.2257 × e −0.0515x (r 2 = 0.6206) ( Figure 4 ).…”

“…This can be attributed to the larger exposed surface area-to-mass ratio in shallots than in Chinese cabbage and the dilution effect, as Chinese cabbage is heavier than shallots [ 35 ]. Bae et al [ 36 ] sprayed boscalid and fludioxonil on leafy vegetables, such as spinach, Chinese cabbage, tatsoi, and Chinese vegetables and found that the amount of pesticide residue in spinach was 2.5–3.0 times higher than that in the other leafy vegetables. This result was attributed to the growth velocity, leaf surface, life-form, and specific surface area characteristics of the test crops.…”

Dissipation behavior and dietary exposure risk of pesticides in Brussels sprout evaluated using LC–MS/MS

“…Although cabbage and Brussels sprout have a similar wrapped-over form, the half-lives are different because of the hypertrophy of cabbage. The half-life of fludioxonil in Brussels sprout (9.1 days) was similar to that noted in mandarin (8.7 days) 29 and longer than that noted in Chinese cabbage (4.0 days) 28 . Mandarins have a bumpy surface, and pesticides are, therefore, likely to adsorb to the surface.…”

“…Some previous studies have assessed the dissipation behavior of indoxacarb in cabbage 25 , tomato 26 , and green chili fruit 27 . Bae et al 28 and Hwang et al 29 conducted studies on the half-life of fludioxonil in mandarin and Chinese cabbage, respectively. However, to the best of our knowledge, no studies have assessed the dissipation behavior of the aforementioned eight pesticide residues in Brussels sprout yet.…”

Residual Characteristics of Bistrifluron and Fluopicolide in Korean Cabbage for Establishing Pre-Harvest Residue Limit

“…(Table 5). 엇 갈이배추 재배 기간 중 시험농약의 생물학적 반감기에 대한 여러 연구자들의 결과는 chlorothalonil 7.45일, indoxacarb 4.2일, lufenuron 5.85일, methalaxyl 1.75일, methomyl 2.42 일, boscalid 7.4일, fludioxonil 4.0일, bifenthrin 2.5일, lamda-cyhalothrin 3.6일, deltamethrin 2.9일로 각각 조사되 었다 (Ko et al, 2008;Bae et al, 2012;Kim et al, 2007). 이러한 결과는 bistrifluron과 fluopicolide의 생물학적 반감 기와 큰 차이를 보이지 않는 것으로 판단되며, 엇갈이배추 중 농약의 생물학적 반감기는 시험농약의 이화학적 특성 및 작물의 비대생장에 의한 증체율에 따른 희석효과가 농 약의 생물학적 반감기를 결정하는 중요한 요인으로 판단되 었다.…”