The effectcs of foliar application of (SO4Zn +SO4Mn) on the symptom of Greening disease of camMat and quytDuong at the mature stage and levels of disease.
2004
Nguyen Bao Ve | Nguyen Thi Minh Chau
To overcome the symptom of Greening disease on mature leaves of camMat and quytDuong at the mature stage and levels of disease, the experiments were carried out in Cantho province by foliar application of SO4Zn + SO4Mn on mature leaves at the ratio of 3 parts of SO4Zn and 1 part of SO4Mn. The foliar application is 3 times, and three levels of SO4Zn + SO4Mn applied are 0,2500 and 5000 ppm with three replications. Data showed that the percentage of recovered shoot increased continuously until 7 after weeks second application of SO4Zn + SO4Mn, then decreased after that. Response of camMat to foliar application of SO4Zn + SO4Mn was better than quytDuong. The number of recovered shoots of immature plants in camMat were higher than that in quytDuong. Infested shoots at primary level of disease recovered better than shoots at secondary level of disease.
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