Determination of multiple-species economic injury levels for rice insect pests

Kandasamy, Selvaraj; Chander, Subhash; Sujithra, M.

doi:10.1016/j.cropro.2011.10.019

Cited by 20 publications

(10 citation statements)

References 16 publications

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“…Similar results were also reported by other scientists (Sarao and Mahal 2008b;Dhawan et al 2010;Sarao et al 2012;Kumar et al 2013) regarding the efficacy of insecticides in managing the rice insect pests. Selvaraj et al (2012) determined single species (stem borers, leaf folder and planthoppers) as well as multi-species economic injury level for rice insect pests. The single species injury level of leaf folder and stem borer ranged from 2.9-6.4% folded leaves and 1.9-3.0% WE, respectively.…”

Section: Discussionmentioning

confidence: 99%

Impact of Multiple Insect-Pest Incidence on Yield in Basmati Rice

Sarao¹,

Shera²,

Singh³

2015

Cereal Research Communications

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The experiments for determining the multiple insect-pest incidence on yield loss in basmati rice was conducted for two crop seasons. Five treatments were, viz. application of imidacloprid in vegetative stage; application of granular insecticide in vegetative stage; application of higher dose of Urea; augmentive releases of yellow stem borer egg mass at vegetative and booting stage; untreated control. During both the years, the correlation between grain yield and dead heart, leaf folder damage and planthopper population at 50 and 65 DAT and white ear at maturity was negative. The analysis of variance of regression analysis of yield Vs damage levels at different crop growth stages during both the years revealed a significant linear relationship. The yield loss was highly related to incidence of stem borer and leaf folder damage at 50 and 65 DAT during both the years. For integrated pest management, effective monitoring of stem borer and leaf folder from 50 to 65 DAT is required, which appeared as a critical crop growth stage. The farmers should remain cautious during this period to prevent yield loss.

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Section: Discussionmentioning

confidence: 99%

Impact of Multiple Insect-Pest Incidence on Yield in Basmati Rice

Sarao¹,

Shera²,

Singh³

2015

Cereal Research Communications

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“…There were no significant differences in grain yield and growth performance among three hybrid lines resulting from crossbreeding of MH63, MH63 (cry1C*), and MH63 (cry2A*) with Zhenshan 97A (Wang et al., ). Among the rice with varying injury levels of C. medinalis and C. suppressalis , the rice with no injuries attained the highest yields (Selvaraj et al., ). Also the injury by non‐target insect pests on Bt rice should be considered when evaluating yield performance.…”

Section: Discussionmentioning

confidence: 99%

Effectiveness in the field of Bt rice lines against target pests under various cultural regimes

Yang

Han

et al. 2015

Entomologia Exp Applicata

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China has a long history of rice cultivation, incorporating several cultural practices known to influence damage by insect pests. Transgenic Bt rice expresses lepidopteran-specific insecticidal proteins that primarily target lepidopteran insect pests. However, the effectiveness of Bt rice against target insect pests under different cultural regimes has not been evaluated. In this study, the effectiveness of Bt rice lines against rice leaffolder, Cnaphalocrocis medinalis (Guen ee) (Lepidoptera: Pyralidae), and striped stem borer, Chilo suppressalis Walker (Lepidoptera: Crambidae), was evaluated under various transplanting densities, crop establishment methods, and planting times. The results showed that Bt rice lines (T2A-1 and T1C-19, containing Cry2A and Cry1C, respectively) could prevent damage by these target pests under a range of cultural practices. Injury by C. medinalis or C. suppressalis on rice did not differ with the rice lines under various transplanting densities. Direct-seeded non-Bt rice MH63 suffered heavier injury by C. medinalis and C. suppressalis than it did with transplanting, whereas injury to the two Bt rice lines did not differ with planting methods. Planting time significantly affected injury by C. medinalis or C. suppressalis on non-Bt rice, whereas injury to Bt rice lines did not differ with planting time. These results suggest that transplanting density, planting method, and planting time did not significantly affect the resistance of two Bt rice lines, due to their high insecticidal activity against target insects.

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“…Some studies have investigated the fact that the complex damage caused by multiple species is greater than that of any single species. 8 , 9 Similarly, Selvaraj et al 10 established the yield loss as a function of damage to determine multiple pest economic injury levels (EILs). The EIL of a single pest species for RLF and the stem borer ranged from 2.9 to 6.4% folded leaves and 1.9 to 3.0% whiteheads, respectively, whereas that of the brown planthopper (BPH) Nilaparvata lugens (Stål) varied between 5.5 and 7.3 hoppers per hill.…”

Section: Introductionmentioning

confidence: 99%

Impact of Day Intervals on Sequential Infestations of the Rice Leaffolder Cnaphalocrocis medinalis (Guenée) (Lepidoptera: Pyralidae) and the White-Backed Rice Planthopper Sogatella furcifera (Horváth) on Rice Grain Damage

et al. 2014

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The present study illustrates that different day intervals (DIs) between the sequential infestations of two pest species, the rice leaffolder (RLF) Cnaphalocrocis medinalis Guenée (Lepidoptera: Pyralidae) and the white-backed rice planthopper (WBPH) Sogatella furcifera Horváth (Hemiptera: Delphacidae), have a significant impact on the rice yield loss rate (YLR) and on the carbohydrate contents of rice plants. For WBPH release after RLF release (WRARR), the YLR decreased with the increasing DIs, and the YLR at the 24 DI was significantly lower compared to that at the 6 and 12 DIs and had a minimum value for a simultaneous infestation of the two pest species (SITS). In contrast, for RLF release after WBPH release (RRAWR), the YLR at the 24 DI had a maximum value and was significantly higher compared to that at the 6 and 12 DIs and the SITS. These findings indicate that damaged rice plants gradually recover, with an increase in the DI for WRARR. The above results were demonstrated by biochemical tests. Therefore, the sequential infestation of the two pest species and their DIs should be considered for integrated pest management (IPM) and control strategies for rice pests.

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Determination of multiple-species economic injury levels for rice insect pests

Cited by 20 publications

References 16 publications

Impact of Multiple Insect-Pest Incidence on Yield in Basmati Rice

Impact of Multiple Insect-Pest Incidence on Yield in Basmati Rice

Effectiveness in the field of Bt rice lines against target pests under various cultural regimes

Impact of Day Intervals on Sequential Infestations of the Rice Leaffolder Cnaphalocrocis medinalis (Guenée) (Lepidoptera: Pyralidae) and the White-Backed Rice Planthopper Sogatella furcifera (Horváth) on Rice Grain Damage

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