The effects of foliar application of (SO4Zn + SO4Mn) on the symptom of Greening disease of Cam Mat and Quyt Duong at the immature tree stage of growing and levels of disease
2004
Nguyen Bao Ve | Nguyen Thi Minh Chau
To overcome the symptom of Greening disease on mature leaves of Cam Mat and Quit Duong at the immature tree stage of growing 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 weeks after second application of SO4Zn + SO4Mn, then decreased after that. Response of Cam Mat to foliar application of SO4Zn + SO4Mn was better than Quit Duong. The number of recovered shoots of immature plants in Cam Mat were higher than that in Quit Duong. Infested shoots at primary level of disease recovered better than shoots at secondary level of disease.
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