Chitosan application on agriculture

COS protects tobacco from
中
tobacco
心 第 一
mosaic
批 启 动
virus
的 项
(TMV)
目
Results:
COS
CK
Optimum concentration for spraying: 50 ppm;
COS is better to be applied at least one day before the outbreak of
TMV, and its anti-virus activity will last no less than 9 days;
Under 50 ppm, the copy of TMV and long-distance move in
tobacco could be significantly inhibited;
COS increases the ability of tobacoo against TMV
COS/(mg·L -1 )
Disease
index
Decreasing rate of
disease index/(%)
Significant
difference (5%)
Time of
pretreatment
Disease
index
Decreasing rate of disease
index/(%)
Significant
difference (5%)
25 15.00 78.18 b
72h
CK
13.01
70.54
81.56 a
50 10.00 85.45 a
75 21.00 69.45 b
100 35.00 49.09 c
CK 68.75
48h
CK
24h
CK
12h
CK
17.52
88.53
15.75
68.75
53.75
81.254
80.21 a
77.09 a
33.8 b