Ecological control effects of rice-duck integrated farming on main diseases,insects and weeds in paddy fields ecosystem

The ecological effects of rice-duck integrated farming on developing regularity of rice diseases,insects and weeds were studied.The results showed that rice-duck integrated farming could prevent 96.1% of the weeds from growing,thus reduced the varieties of the weeds,although the Pielou evenness index significantly rose.Rice-duck integrated farming had visible ecological effect on control over brown planthoppers,and the total prevention rate reached 65.49%.By adopting rice-duck integrated farming,the ducks preyed on spiders,which reduced the numbers of spiders,as a result,the ratio between spiders and brown planthoppers was significantly increased.Although ducks had some control effect on Cnaphalocrocis medinalis Guenee and Chilo suppressalis Walker,their control ability over such insects was weakened with the growth of rice plants.Rice-duck integrated farming cut down the occurrence rate of rice stripe disease event if this method could not fully prevent the disease from arising.Besides,rice-duck integrated farming also effectively controled rice blast,and the prevention rate reached 57.02%.In addition,the article also probed into the ecological mechanism of rice-duck integrated farming′s control over rice diseases,insects and weeds.