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Jhansi Lakshmi, V.

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

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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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• Role of Honeydew of Rice Hoppers as a Kairomone and Nutrient to the Predatory Mirid Bugs, Cyrtorhinus lividipennis Reuter and Tytthus parviceps (Reuter) (Hemiptera: Miridae)

Abstract Views :232  |  PDF Views:118

Authors

V. Jhansi Lakshmi ¹, I. C. Pasalu ¹, K. V. Rao ¹, K. Krishnaiah ¹

Affiliations
1 Rice Research (ICAR), Rajendranagar, Hyderabad, 500030, IN

Source

Journal of Biological Control, Vol 19, No 2 (2005), Pagination: 93-97

Abstract

Honeydew of brown planthopper (BPH), whitebacked planthopper (WBPH) and green leafhopper (GLH) of rice was evaluated for its role as an attractant and nutrient to their egg predators, Cyrtorhinus lividipennis Reuter and Tytthus parviceps (Reuter). The mirid bugs were attracted in more numbers to plants coated with honeydew than that of distilled water. The mirid bugs survived for 4-6 days on honeydew and 11-20 days on insect prey. It was found that honeydew attracts mirid bugs to the treated surface but it could not support the survival of mirid bugs for longer time.

Keywords

Cyrtorhinus lividipennis, Honeydew, Kairomone, Rice Hoppers, Tytthus parviceps.

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

Abstract Views :229  |  PDF Views:111

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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• Role of Rice Plant and its Extracts in Attracting Predatory Mirid Bugs, Cyrtorhinus Uvidipennis Reuter and Tytthus parviceps (Reuter) (Hemiptera: Miridae)

Abstract Views :213  |  PDF Views:121

Authors

V. Jhansi Lakshmi ¹, L. C. Pasalu ¹, K. Krishnaiah ¹

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

Source

Journal of Biological Control, Vol 20, No 2 (2006), Pagination: 175-181

Abstract

Healthy and hopper (BPH, WBPH and GLH) infested rice plants, different plant parts (leaf, stem and panicle) and rice plants of different ages (15, 40, 75 day old and harvesting stage plants) and their extracts were evaluated as the sources of synomones for attracting predatory mirid bugs viz., Cyrtorhinus lividipennis Reuter and Tytthus parviceps (Reuter) to the plant ecosystem. Rice plant and its extracts served as source of synomone for the mirid bugs, Mirid bugs exhibited preference towards hopper damaged rice plants and their extracts, Brown planthopper (BPH) damaged rice plants and extracts were more attractive to the mirid bugs than white backed planthopper (WBPH) and green leafhopper (GLH) damaged plants and their extracts. Among plants of different ages, 75 day old plants and their extracts were preferred by mirid bugs to 40 day old, 15 day old and harvesting stage plants and their extracts. Rice leaf extracts was more attractive to the mirid bugs compared to stem and panicle extracts. Rice plant plays an important role in attracting mirid bugs to the plant system and mird bugs were able to distinguish the insect damaged and undamaged plants and recognize plants of suitable age.

Keywords

Brown planthopper, Cyrtorhinus lividipennis, Green Leafhopper, Rice, Synomones, Tytthus parviceps, Whitebacked Planthopper.

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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 :206  |  PDF Views:128

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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• Comparative Biology and Prey Preference of Cyrtorhinus lividipennis Reuter and Tytthus parviceps (Reuter) (Hemiptera:Miridae) on Planthoppers and Leafhopper of Rice

Abstract Views :281  |  PDF Views:128

Authors

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

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

Source

Journal of Biological Control, Vol 16, No 2 (2002), Pagination: 103-107

Abstract

Biology and host preference of Cyrtorhinus lividipennis and Tytthus parviceps and their predatory efficiency on rice planthoppers and leafhoppers were studied in the greenhouse. The fecundity, nymphai survival, body weight and body size of both C. lividipennis and T. parviceps were significantly higher on BPH oviposited plants compared to those on WBPH or GLH ofiposited plants. There was no significant difference in the adult female and male longevity on different hosts. In general, the adults survived for 11-20 days. The pre-oviposition period ranged from 1.5 to 2.8 days on different hosts. Incubation and nymphai periods were prolonged on GLH oviposited plants compared to BPH and WBPH oviposited rice plants. In both choice and no choice tests, C. lividipennis and T. parviceps preferred and consumed more BPH and WBPH eggs than GLH eggs.  nymphs were better predators than adults whereas the predatory efficiency of nymphs and adults was similar in T. parvicepsC. lividipennis. It is evident that BPH is the preferred and primary host for both C. lividipennis and T. parviceps and they secondarily adapted to WBPH and GLH.

Keywords

Biology, Cyrtorhinus lividipennis, Nephotettix virescens, Nilaparvata lugens, Prey Preference, Sogatella furcifera, Tytthus parviceps.

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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 :244  |  PDF Views:119

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 :217  |  PDF Views:95

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 :218  |  PDF Views:102

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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• Rice Leafhopper and Planthopper Honeydew as a Source of Host Searching Kairomone for the Mirid Bug Predator, Cyrtorhinus lividipennis (Reuter) (Hemiptera: Miridae)

Abstract Views :240  |  PDF Views:127

Authors

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

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

Source

Journal of Biological Control, Vol 14, No 2 (2000), Pagination: 7-13

Abstract

Kairornonal activity of honeydew of rice green leafhopper (GLH) Nephotettix virescence (Distant) and planthoppers viz,,brown planthoppcr (RPH) Nilaparvata lugens (Stal) and whitebacked planthopper (WBPH) Sogatella furcifera (Horv) on their mirid bug predator Cyrtorhinus lividipennis (Reuter) was studied in the laboratory. Honeydew of all the hoppers was found to be attractive to all stages of the mirid bugs both in the Petri-dish and olfactometer bioassays, Mirid bugs were attracted to the treated spot, moved (quickly on the untreated area, searched slowly on the treated spot making sharp turns and showed antennal palpation. When choice was given between BPH and WBPH honeydew, mirid bugs preferred to move towards BPH honeydew. When choice was given among RPH, WBPH and GLH honeydew, mirid bugs showed the highest response to GLH honeydew followed by that of BPH and WBPH. Mirid bug nymphs perceived and reached the honeydew source quickly compared to the females. In olfactometer studies, mirid bugs behaved similarly when released in groups and individually.

Keywords

Cyrtorhinus lividipennis, Honeydew, kairomone, Nephotettix virescens, Nilaparvata lugens, Sogatella furcifera.

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

Abstract Views :232  |  PDF Views:109

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 :189  |  PDF Views:126

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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• A Comparative Antibacterial Study of Ixora coccinea L. Plants with Red, Orange, Pink and White Flowers

Abstract Views :444  |  PDF Views:151

Authors

Sowjanya Pulipati , P. Sushma , V. Jhansi Lakshmi , P. Srinivasa Babu

Source

Asian Journal of Pharmaceutical Research and Health Care, Vol 4, No 1 (2012), Pagination: 7-10

Abstract

Eradication of pathogenic bacterial infection is the most effective means of curing several diseases and preventing recurrent episodes. The main objective of this study was to evaluate the comparative antibacterial activity of Ixora coccinea L. plants with red, orange, pink and white flowers against tested bacteria Escherichia coli, Staphylococcus aureus, Bacillus subtilis, Klebsiella pneumoniae. Both the methanolic and aqueous extracts of all four types of flowers exhibited considerable antibacterial activities against bacteria. The methanolic extracts of red and pink flowers exhibited high antibacterial activity whereas orange flowers showed moderate activity while white flowers showed low activity. The aqueous extracts displayed less inhibitory effects compared to the methanolic extracts. The aqueous extracts of red and pink flowers showed considerable high antibacterial activity compared to orange and white flowers. The preliminary phytochemical screening revealed the presence of alkaloids, glycosides, steroids, carbohydrates, flavonoids and tannins.

Keywords

Ixora coccinea, Antibacterial Activity, Cup-Plate Diffusion Method.

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