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Issue:ISSN 2095-1353
           CN 11-6020/Q
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Your Position :Home->Past Journals Catalog->2013年50 No.3

Effect of leaf cutting at different growth stages on growth, yield and physiological traits of two rice cultivars
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Key Words:Cnaphalocrocis medinalis, leaf cutting, growth, yield, root system activity
Abstract:cuttin Leaf g tests simulating the damage caused by leaf folder, Cnaphalocrocis medinalis, were carried out to measure yield loss of rice at different growth stages (seedling stage, tillering stage and booting stage). Also, chlorophyll content and root system activity were measured after various extents of cutting (10%, 30%, 50% and 70% in the seedling and tillering stage, 10%, 20%, 30% and 50% in the booting sage ) of the leaves of two rice varieties; super rice variety Yongyou 8 and japonica rice variety Ning 88. 10-70% cutting at the seedling stage and tillering stage did not to affect rice yield and growth, and might actually increase rice yield. At the booting stage, yield was not affected when less than 10% of the leaf was cut; yield loss was less than 10% when <20% of the leaf was cutand yield loss was 20-25% when 50% of the leaf was cut. Leaf cutting at the seedling and tillering stages caused little change in chlorophyll content, while root system activity was enhanced. This implies that rice has strong tolerance for leaf damage before the booting stage. We suggest that chemical control of the leaf folder can be reduced in the early growth period of rice.
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