TY  - BOOK
AU  - Zhizhong Shao
AU  - Chaocheng
AU  - Jixian Chen
AU  - Xiongfei Yang
AU  - Yongqing Xiao
TI  - Study on yield loss of rubber Hevea caused by Oidium Heveae
PB  - Proceedings of IRRDB Conference: NR Industry: Responding to Globalization, 7-8 September 2004, Kunming International Convention & Exhibition Center, China. pp.441-450.
KW  - Disease degree
KW  - Dry rubber yield
KW  - Phytophthora leaf fall
KW  - Powdery mildew
KW  - Rubber fruit number
KW  - Rubber tree
N2  - From 1984 to 1989, taking main rubber clones planted in Xishuangbanna and Lincang as the material, and using artificial control of disease, influences of the serious degree of powdery mildew on rubber production, rubber fruit number and Phytophthora leaf fall were determined repeatedly through comparative trials between blocks, productive experiments and verification. The results indicated that there was a curve relation between the loss rate of dry rubber yield and the serious level of disease; the effect of light disease on dry rubber yield was not remarkable, medium disease did not reduced the yield but increased it obviously and serious or special serious disease decreased the yield significantly. It could increase the dry rubber yield to some extent and evidently control the Phytophthora leaf fall to maintain medium intensity of powdery mildew. Therefore, medium level of powdery mildew can be tolerant economically, which can be used as a standard of cost-effective control. It can reduce the loss of rubber yield to keep tapping under the precondition of protecting the second whorl leaves after large numbers of leaves fall caused by powdery mildew. Moreover, light or medium disease will not remarkably influence the dry rubber yield of the next year
ER  -