Role of different habitats for the functional response of<i>Crytorrhinus lividipennis</i>(Hemiptera: Miridae) on<i>Nilaparvata lugens</i>(Hemiptera: Delphacidae)

System of Rice Intensification is a new method of cultivation that has been widely done to improve the efficiency of water use, which can affect pest and predator populations. The research aims to determine the types of pests and natural enemies as predators in various irrigations and local varieties of rice. The study was conducted at the Research Field and Laboratory of Protection of the Faculty of Agriculture, University of Muhammadiyah Yogyakarta. The research was carried out with a 3x4 Strip Plot Design in a Completely Randomized Block Design with 3 replications. The factor I was the type of irrigation, consisting of 3 types of treatment, namely conventional irrigation, SRI intermittent irrigation for 10 days inundated 5 days dried, and irrigation for 7 days inundated, 3 days dry. Factor II was rice variety, which consists of 4 varieties, namely Rojolele Genjah, Mentik Wangi, Pandan Wangi, and Ciherang. Observation of pests and predators was done once a week for 5 weeks using the Sweeping Net trap. The numbers of pests and predators were analyzed by Generalized Linear Model analysis. The difference in the mean was further tested by the Tukey test. The results showed that the method of irrigation and varieties gave different effects depending on the role of the insect. Types of irrigation do not affect the population of pests, but irrigation affects the predator population. Varieties affect pest populations and predators. Irrigation types and varieties interact in determining pest populations and predators.

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Insect Population in Rice Ecosystems with Various Types of Irrigation and Local Rice Varieties

Isnawan

Ramadhanti

2021

IOP Conf. Ser.: Earth Environ. Sci.

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Effects of azoxystrobin and difenoconazole on the development, fecundity, and predatory capacity of Cyrtorhinus lividipennis

Hu,

Cheng,

Chen

et al. 2024

Entomologia Exp Applicata

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The predatory bug Cyrtorhinus lividipennis Reuter (Hemiptera: Miridae) is an important biological control agent for planthoppers, such as Nilaparvata lugens (Stål) (Hemiptera: Delphacidae), and leafhoppers in rice fields (Oryza sativa L., Poaceae). In this study, the sublethal effects of azoxystrobin and difenoconazole, two fungicides extensively used in rice production, on this predatory bug were investigated. The results indicated that exposure to the two fungicides at the third instar had no influence on developmental duration, but difenoconazole resulted in a 25.2% decrease in the lifespan of adult males. When exposed as newly emerged adults, azoxystrobin caused a 33.5% decrease in female longevity. The pre‐oviposition period of azoxystrobin‐treated females mating with azoxystrobin‐treated males was shortened by 44.9%, compared with the control, whereas the pre‐oviposition period of difenoconazole‐treated females mating with control males was lengthened by 32.2% compared with the control group. However, the two fungicides had no effect on fecundity and egg hatchability. Furthermore, the two fungicides did not impact the average consumption of C. lividipennis of N. lugens individuals. They did stimulate the response of C. lividipennis males to rice plants infested by N. lugens in a two‐choice H‐shaped olfactometer test. Also, the predatory capacity of C. lividipennis males was increased after exposure to difenoconazole, whereas the predatory capacity of females was decreased after exposure to the two fungicides. Overall, our results indicated that azoxystrobin and difenoconazole pose no notable risk to C. lividipennis. These findings establish a foundation for the rational and coordinated utilization of fungicides and biological control agents in rice ecosystems.

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Role of different habitats for the functional response ofCrytorrhinus lividipennis(Hemiptera: Miridae) onNilaparvata lugens(Hemiptera: Delphacidae)

Cited by 2 publications

References 14 publications

Insect Population in Rice Ecosystems with Various Types of Irrigation and Local Rice Varieties

Insect Population in Rice Ecosystems with Various Types of Irrigation and Local Rice Varieties

Effects of azoxystrobin and difenoconazole on the development, fecundity, and predatory capacity of Cyrtorhinus lividipennis

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