Krishnaiah, N. V.

• Potential Toxicity of Selected Insecticides to Rice Leafhoppers and Planthoppers and their Important Natural Enemies

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Authors

V. Lakshmi Jhansi ¹, N. V. Krishnaiah ¹, G. R. Katti ¹

Affiliations
1 Rice Research, Rajendranagar, Hyderabad 500 030, Andhra Pradesh, IN

Source

Journal of Biological Control, Vol 24, No 3 (2010), Pagination: 244-252

Abstract

Potential toxicity of selected insecticides to rice brown planthopper (BPH), Nilaparvata lugens, whitebacked planthopper (WBPH), Sogatella furcifera, green leafhopper (GLH), Nephotettix virescens and their important predators in rice ecosystem, viz., green mirid bug, Cyrtorhinus lividipennis, brown mirid bug, Tytthus parviceps and veliid predator, Microvelia douglasi atrolineata was assessed in the greenhouse. Among the single compound insecticides, spinosad was moderately toxic to BPH followed by flubendiamide while ethiprole and indoxacarb were not effective against BPH, WBPH and GLH. Flubendiamide was least toxic to green mirid bug compared to acephate and other insecticides. Ethiprole and spinosad were less toxic to nymphs of brown mirid bug. Individually ethiprole, spinosad, flubendiamide were less toxic to Microvelia, but indoxacarb was more toxic. Ethiprole+imidacloprid and thiamethoxam+lambdacyhalothrin exhibited excellent initial and persistent toxicity against BPH, WBPH and GLH, but these two combination products were also highly toxic to all the three natural enemies recording 100% mortality within 24 hours. Flubendiamide+fipronil exhibited moderate toxicity against BPH, but was less effective against WBPH and ineffective against GLH. However, this product was highly toxic to both the mirid bugs and relatively less toxic to veliid bug.

Keywords

Nilaparvata lugens, Sogatella furcifera, Nephotettix virescens, Rice, Potential Toxicity, Insecticides, Combination Products, Cyrtorhinus lividipennis, Tytthus parviceps, Microvelia douglasi atrolineata.

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• Relative Safety of Combination Products of Insecticides to Tytthus Parviceps (Reuter), a Predator of Planthoppers and Leafhoppers in Rice

Abstract Views :192  |  PDF Views:106

Authors

V. Jhansi Lakshmi ¹, N. V. Krishnaiah ¹, I. C. Pasalu ¹

Affiliations
1 Directorate of Rice Research (lCAR) Rajendranagar, Hyderabad 500030, Andhra Pradesh, IN

Source

Journal of Biological Control, Vol 20, No 1 (2006), Pagination: 69-71

Abstract

Safety of four combination products of insecticides and two single Compound insecticides to adults of brown mirid bug Tyttus parviceps, a predator of rice planthoppers was assessed under greenhouse conditions. Two combination products viz chlorpyriphos (50%.) + cypermethrin (5%,) (at 344 ppm.) and acephate (45%) + cypermethrin (5%) (at 500 ppm) were relatively safer than other two combination products, but less safe than acephate (750 ppm) or monocrotophos (500 ppm). In general, all the products were safer to nymphs of T. parviceps than to adults.

Keywords

Insecticides, Leafhoppers, Planthoppers, Predator, Relative Safety, Rice, Tytthus Parviceps.

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• Relative Safety of Selected Acarieides to Three Hemipteran Natural Enemies of Planthoppers in Rice Ecosystem

Abstract Views :233  |  PDF Views:113

Authors

V. Jhansi Lakshmi ¹, N. V. Krishnaiah ¹, I. C. Pasalu ¹

Affiliations
1 Directorate of Rice Research (ICAR) Rajendranagar, Hyderabad 500 030, Andhra Pradesh, IN

Source

Journal of Biological Control, Vol 20, No 2 (2006), Pagination: 141-146

Abstract

Greenhouse studies on the toxicity of twelve selected acarieides to hemipteran predators of planthoppers in rice viz., green mirid bug (Cyrtorhitnus lividipennis); brown mirid bug (Tytthus parviceps) and veliid bug (Microvelia douglasi atrolineata) revealed that fenpropathrin at ISO ppm and diafenthiuron at 450 ppm were highly toxic to these predators and need to be avoided in mite pest management programmes in rice. Spiromesifen at 72 ppm, pyriproxifen at 75 ppm, milbemectin at 2.5 ppm and dicofol at 500 ppm were less toxic to these predators and can be preferred. Other acaricides like profenophos (500 ppm), ethion (500 ppm), propargite (570 ppm), abamectin (10 ppm) and fenazaquin (125 ppm) were moderately toxic to these predators and can be selectively used depending on their potential toxicity to the mite species to be tackled in rice ecosystem.

Keywords

Acarieides, Cyrlorhinus lividipeimis, Microvelia douglasi atrolineata, Miles, Rice, Toxicity, Tytthus parviceps.

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• Safety of Combination Products and Single Compound Insecticides to Microvelia Douglasi Atrolineata Bergroth, a Predator of Planthoppers in Rice

Abstract Views :207  |  PDF Views:129

Authors

V. Jhansi Lakshmi ¹, I. C. Pasalu ¹, N. V. Krishnaiah ¹, T. Lingaiah ¹

Affiliations
1 Directorate of Rice Research (ICAR) Rajendranagar, Hyderabad 500030, Andhra Pradesh, IN

Source

Journal of Biological Control, Vol 17, No 2 (2003), Pagination: 121-124

Abstract

Greenhouse studies were carried out on relative safety of insecticides to veliid bug, Microvelia douglasi atrolineata, a predator of plantboppers in rice. Tbe results indicated tbat four combination products, viz., chlorpyriphos 50% + cypermethrin 5% at 344 ppm; betacyfluthrin 1.25% + chlorpyriphos 25% at 393 ppm; acepbate 45% + cypermetbrin 5% at 500 ppm and imidacloprid 5% + betacyfluthrin 5% at 30 ppm and two single compounds, viz., betacyfluthrin at 12.5 ppm and thiacloprid at 120 ppm were more toxic than monocrotophos (500 ppm) and acephate (750 ppm).

Keywords

Combination Products, Microvelia Douglasi atrolineata, Relative Safety.

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• Safety of some Insecticides to Brown Mirid Bug, Tytthus parviceps (Reut.) (Hemiptera: Miridae), a Predator of Brown Planthopper, Nilaparvata lugens (Stal) (Homoptera: Delpbacidae) in Rice

Abstract Views :247  |  PDF Views:121

Authors

V. Jhansi Lakshmi ¹, N. V. Krishnaiah ¹, I. C. Pasalu ¹, T. Lingaiah ¹, K. Krishnaiah ¹

Affiliations
1 Department of Entomology Directorate of Rice Research Rajendranagar, Hyderabad 500030, Andhra Pradesh, IN

Source

Journal of Biological Control, Vol 15, No 1 (2001), Pagination: 43-48

Abstract

In the greenhouse, the relative safety or thiamethoxam at 50, 25 and 12 ppm, imidacloprid at 50 ppm, fipronil at 100 ppm and check insecticide acephate at 1200 ppm along with untreated control to the brown mirid bug, Tytthus parviceps (Reuter) was assessed. The results revealed that thiamethoxam at 50 ppm and 25 ppm was as safe as imidacloprid 50 ppm, less safe than acephate 1200 ppm but more safe than fipronil 100 ppm.

Keywords

Insecticides, Nephotettix virescens, Nilaparvata lugens, Persistent Toxicity, Relative Safety, Rice, Sogatella furcifera, Tytthus parviceps.

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• Relative Safety of some New Insecticides to Microvelia douglasi atrolineata Bergroth, an Aquatic Predator of Hoppers in the Rice Ecosystem

Abstract Views :219  |  PDF Views:98

Authors

N. V. Krishnaiah ¹, V. Jhansi Lakshmi ¹, I. C. Pasalu ¹, T. Lingaiah ¹, K. Krishnaiah ¹

Affiliations
1 Department of Entomology, Directorate of Rice Research Rajendranagar, Hyderabad 500 030, Andhra Pradesh, IN

Source

Journal of Biological Control, Vol 15, No 1 (2001), Pagination: 49-52

Abstract

In a greenhouse experiment, the relative safety of thiaruethoxam at 50, 25 and 12 ppm, imidacloprid at 50 ppm, fipronil at 100 ppm, acephate at 1200 ppm along with untreated control was assessed to the aquatic veliid predator, Microvelia douglasi atrolineata Bergroth, which feeds on nymphs of brown planthopper, Nilaparvata lugens (Stal). The results revealed that fipronil 100 ppm was the safest treatment followed hy acephate at 1200 ppm and thiamethoxam at 12 ppm.

Keywords

Insecticides, Microvelia douglasi atrolineata, Nilaparvata lugens, Relative Safety, Rice.

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• Safety of Thiamethoxam to cyrtorhinus Lividipennis Reuter (Hemiptera: Miridae), a Predator of Brown Planthopper,Nilaparvata lugens (stal) in Rice

Abstract Views :222  |  PDF Views:105

Authors

V. Jhansi Lakshmi ¹, N. V. Krishnaiah ¹, I. C. Pasalu ¹, T. Lingaiah ¹, K. Krishnaiah ¹

Affiliations
1 Department of Entomology Directorate of Rice Research Rajendranagar, Hyderabad 500 030, Andhra Pradesh, IN

Source

Journal of Biological Control, Vol 15, No 1 (2001), Pagination: 53-58

Abstract

In greenhouse studies, thiamethoxam at 50, 25 and 12 ppm, imidacloprid at 50 ppm, fipronil at 100 ppm and the check insecticide acephate at 1200 ppm along with untreated control were assessed for their relative safety to nymphs and adults of green mirid bug Cyrtorhinus lividipennis Reuter, an effective predator of brown planthopper. For the adults of C.Hvidipennis, thiamethoxam at 25 ppm and 12 ppm was as safe as imidacloprid 50 ppm but less safer than acephate 1200 ppm. However, fipronil at 100 ppm and thiarnethoxam at 50 ppm were less safe. For the nymphs, thiamethoxam at 12 ppm was as safe as imidacloprid 50 ppm and fipronillOO ppm but less safer than acephate 1200 ppm. Thiamethoxam at 25 and 50 ppm was less safer than all other treatments.

Keywords

Cyrtorhinus lividipennis, Insecticides, Nilaparvata lugens, Rice, Safety.

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• Safety of Neem Formulations Vis-a-Vis Insecticides to Cyrtorhinus lividipennis Reuter, a Predator of Brown Planthoppers Nilaparvata lugens (Stal) in Rice Crop

Abstract Views :238  | 

Authors

V. Jhansi Lakshmi ¹, G. Katti ¹, N. V. Krishnaiah ¹, K. Mahesh Kumar ¹

Affiliations
1 Rice Research, Rajendranagar, Hyderabad 500 030, Andhra Pradesh, IN

Source

Journal of Biological Control, Vol 12, No 2 (1998), Pagination: 119-122

Abstract

A greenhouse study was carried out to test the safety of commonly available neem formulations to the mirid bug, Cyrtorhinus lividipennis Reuter, an effective and widely distributed predator of brown planthopper, compared to that of recommended insecticides in rice. Neemgold at 0.5 per cent and Neemax at 2.0 per cent were safe causing 26.7 and 33.3 per cent mortality, respectively, after 72h exposure; whereas cent per cent mortality was recorded in insecticidal treatments within 24h of exposure.

Keywords

Cyrtorhinus lividipennis, Insecticides, Neem Formulations, Nilaparvata lugens, Rice, Safety.

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• Laboratory Evaluation of Commercial Neem Formulations Vis-a-Vis Insecticides against Egg Parasitoid, Trichogramma japonicum Ashmead (Hymonoptera:Trichogrammatidae)

Abstract Views :237  |  PDF Views:111

Authors

V. Jhansi Lakshmi ¹, G. Katti ¹, N. V. Krishnaiah ¹, T. Lingaiah ¹

Affiliations
1 Directorate of Rice Research, Rajendranagar, Hyderabad 500030, Andhra Pradesh, IN

Source

Journal of Biological Control, Vol 11, No 1&2 (1997), Pagination: 29-32

Abstract

Laboratory experiments were carried out to study the effect of neem formulations vis-a-vis insecticides on Trichogramma japonicum Ashmead, based on rate of parasitization and emergence of adults from parasitised eggs. The results revealed that Econeem and Neem Azal T/S (0.1-1.0 %) were safer compared to insecticides, particularly quinalphos and chlorpyriphos which had adverse effects on parasitization. Some neem formulations like Nimbecidine (0.25-4.0 %), Neemgold (2.0-4.0 %) and Rakshak (1.0%) also had adverse effects on parasitism.

Keywords

Egg Parasitoid, Insecticides, Neem Formulations, Trichogramma japonicum.

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• Safety of Neem Formulations and Insecticides to Microvelia douglasi atrolineata Bergroth (Heteroptera:Veliidae), a Predator of Planthoppers in Rice Ecosystem

Abstract Views :192  |  PDF Views:129

Authors

V. Jhansi Lakshmi ¹, G. Katti ¹, N. V. Krishnaiah ¹

Affiliations
1 Directorate of Rice Research, Rajendranagar, Hyderabad 500030, Andhra Pradesh, IN

Source

Journal of Biological Control, Vol 11, No 1&2 (1997), Pagination: 33-36

Abstract

A glasshouse study carried out to know the relative safety of neem formulations and insecticides to Microvelia douglasi atrolineata Bergroth revealed that Neemax (2 and 4 %) and Rakshak (0.2 and 0.5 %) were the safest neem formulations while among insecticides, phorate and carbofuran (1 kg a.i./ha) granular application and quinalphos spray (0.05%) were relatively safer.

Keywords

Insecticides, Microvelia douglasi atrolineata, Neem Formulations, Planthoppers, Predator, Rice Ecosystem.

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• Some Observations on Brown Mirid Bug Tytthus parviceps Reuter a Predator of Rice Brown Planthopper, Nilaparvata lugens Stal.

Abstract Views :198  |  PDF Views:116

Authors

P. R. Srinivas ¹, N. V. Krishnaiah ¹

Affiliations
1 Directorate of Rice Research, Rajendranagar, Hyderabad 500 030, IN

Source

Journal of Biological Control, Vol 9, No 1 (1995), Pagination: 51-51

Abstract

Many workers observed the predatory activity of mirid bugs against rice hoppers (Bae and Pathak, 1966). The bugs prey on the eggs, nymphs and adults of rice leaf and planthoppers and have been considered as effective predators (Staphley, 1976). Of the mirid bugs, Cyrto rhinus lividipennis Reuter is widely distributed and most common; the other mirids preying on the planthoppers being Tytthus parviceps Reuter and T. chinensis (Stal) (Stanley, 1976; Manjunath et al., 1978; Basilo and Heong, 1990).

Keywords

Nilaparvata lugens, Mirid Predators, Tytthus parviceps.

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