[Effect of intermittent irrigation in paddy fields on mosquito control].

Objective: To investigate the effects of intermittent irrigation in paddy fields on mosquito control and the impact on growth and yield of rice.

Methods: The paddy fields were divided into an experimental group and a control group. In the same context of other measures, the experimental group was performed with intermittent irrigation and the control group with conventional irrigation. The densities of larvae of Anopheles sinensis and Culex tritaeniorhynchus were surveyed by the suction trapping method. The plant traits, leaf age process, tiller dynamics, yield structure and actual rice production were observed.

Results: Compared with the control group, the average densities of larvae of Anopheles sinensis and Culex tritaeniorhynchus were reduced of 10.32/m2 and 13.93/m2 respectively in the experimental group, the control rates were 79.84% and 72.14% respectively, the average yield increased of 22.5 kg/667 m2, water conservation was 187.4 m3/667 m2, and the increased revenue was 75.78 yuan/667 m2.

Conclusions: The intermittent irrigation in paddy fields not only can control mosquito larva breeding effectively, but also save water and electricity, and increase the harvest.