Title: Evaluating the efficacy of different methods to control rice striped stem borer under water stress conditions in the field
Author: Farzad Majidi-Shilsar
Abstract: Today, integrated pest management is used to control rice borers in rice fields. This can be achieved if the rice field is not in a normal state of water shortage but in the event of drought stress, which of the following control methods will be most effective in controlling striped stem borer? Based on this, this experiment was performed on the Hashemi rice cultivar with a split-plot design based on a randomized complete block with 3 replications with dimensions of 5 × 4 m. The treatments tested were as follows. The main factor includes: 1- Permanent flooding with daily irrigation, 2- Periodic irrigation with 5 days interval 3- Periodic irrigation with 10 days interval, and 4- Periodic irrigation with 15 days interval and Sub-factor includes: 1- Granulation with diazinon insecticide 10% at the rate of 15 kg per hectare, 2- Foliar spraying with liquid insecticide (Fenitrothion) at the rate of one liter per hectare, 3- Biological control (release of Trichogramma wasp + Bacillus + Beauveria fungus) 4- Using all methods ( Granule toxin spraying + liquid toxin + biological control) was 5-control (without any operation). According to the results of studies conducted during the two years of the experiment, it can be concluded that, firstly, the appropriate irrigation method to control the rice strip stem borer irrigation daily with integrated management and also the granulation method with water in Paddy fields are intended for pest control. Also, the results of studies during two years of experimentation showed that daily and five-day irrigation had the highest yield loss compared to integrated management in the biological control method, and in 10 and 15-day irrigation, the highest yield loss compared to integrated management in the granulation method. was observed. Therefore, in moderate and severe dehydration conditions, biological control and foliar spraying methods have less yield reduction than the granulation spraying method. According to the results, the highest yield was in the daily and 5-day Irrigation regimes. Also, the highest infection was observed in the vegetative and reproductive stages in the control treatment without any control
Keywords: Rice, stem borer, irrigation stress, different irrigation methods
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