Volume 70 Number 4 Article 5 Pages: 207-213
Year 2016 Month 10
Title: Bagging Technology Reduces Pesticide Residues in Table Grapes
Authors: Yizhen Wan, Qi-Rui Hou, Yan Wen, Lei Wang and Quanyou Lu
Most table grape growing regions in China have a continental climate.
This climate is conducive for grape
For this reason, our research group developed a bagging technology and a design product twenty years
ago to protect the berries from damages by pests.
This innovation was granted a patent in 2002 in China.
then, this patent product has been dramatically extended to grape growers in China.
Grape bagging is currently
one of the most widely used viticultural practices in the table grape industry in China.
However, effects of
grape bagging on reduction of pesticide residues were not comprehensively evaluated.
In this study, residues
of seven pesticides, omethoate, cyhalothrin, mancozeb, methylthiophanate, chlorothalonil, metalaxyl mancozeb
and triadimefon, were compared between the bagged and nonbagged berries of the two popular grape cultivars,
‘Red Globe’ and 'Kyoho', planted in China.
The results showed that an annual program of 25-30 and 17-20
of pesticide applications were needed in Yangling, a typical region for growing table grapes in China to control
diseases in Red Globe' and 'Kyoho', respectively.
The recovery of the seven pesticides was over 96% and
the precision of the determining method (RSD) was around 7% in most cases, indicating that the analytical
methods were adequate.
Pesticide residues in both of the nonbagged and bagged berries were lower than the
grape maximum pesticide residue limits required by China government.
The pesticide residues in the bagged
berries were reduced to ~10 % of the residues in the nonbagged berries.
This indicates that the bagging technology
extensively reduced the pesticide residues in the berries.
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