G. Katti ¹, I. C. Pasalu ¹, K. Krishnaiah ¹

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

Abstract

An On-farm trial was carried out to quantify the natural enemy incidence and its impact on pest incidence on BPT-5204 variety of rice in a farmer's field with and without insecticidal applications, during Kharif seasons of 1995 and 1996. The results revealed that need based protection involving single insecticidal application and schedule based protection involving three applications of insecticides were superior 10 natural biocontrol involving no insecticidal application throughout the crop season, in checking pest incidence. However, higher net returns can be obtained by resorting to need based application of insecticides which also results in maintenance of pest population at low levels and build up of natural enemy populations supporting natural control.

Keywords

Natural Biological Control, Rice.

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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

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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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

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

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

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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