http://www.erepo.iihr.ernet.in/handle/123456789/46 2013-05-15T19:46:10Z 2013-05-15T19:46:10Z A, Krishnamoorthy P N, Gangavishalakshi K, Gopalakrishna Pillai http://www.erepo.iihr.ernet.in/handle/123456789/208 2010-12-03T14:12:46Z 2009-01-01T00:00:00Z

Title: Orius tantillus against Scirtothrips dorsalis on capsicum under polyhouse conditions in India Authors: A, Krishnamoorthy; P N, Gangavishalakshi; K, Gopalakrishna Pillai Abstract: The possibility to use native predator Orius tantillus (Motschulsky) (Hemiptera: Anthocoridae) for control of natural infestation of Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) on capsicum (Capsicum annuum L.) grown under polyhouse conditions was tested. Three trials were conducted during 2007 – 2008 on Capsicum F1 hybrid Indira. Two different methods like 1) Release of predator on a Unit area basis and 2) Release of known number plant-1 basis such as 2, 3, 5, and 10 plant-1. Augmentative release of predator was commenced at weekly intervals from the first appearance of thrips. Thrips sampling was done both by counting and visual rating on 0 - 5 scale. A total of 10 plants at random were selected treatment-1 week-1 for counting thrips and predators. In all the trials, thrips density and damage were significantly lower in the predator release treatments as compared to untreated control. About 50% immediate reduction in thrips density was observed in all the trials within a week after release of 1 predator plant-1. Thrips damage was more severe in second trial, which resulted in complete death of plants in the untreated control. Overall 79.41%, 81.48% and 90.90% reduction and 100% increase in thrips density was observed in 2, 3 and 5 predator plant-1 release and untreated control, respectively in third trial in 8 weeks. The result thus indicates that thrips can be controlled effectively under polyhouse conditions on capsicum with the releases of the predator O. tantillus at the rate of 2 plant-1.

2009-01-01T00:00:00Z A, Krishnamoorthy P N, Gangavishalakshi A, Manojkumar M, Mani http://www.erepo.iihr.ernet.in/handle/123456789/207 2010-12-03T14:13:41Z 2007-01-01T00:00:00Z

Title: Influence of some pesticides on entamopathogenic fungis Lecanicillium lecanii Authors: A, Krishnamoorthy; P N, Gangavishalakshi; A, Manojkumar; M, Mani Abstract: An in vitro study was conducted to determine the interaction effect of ten pesticides tested at field recommended dose on conidial germination, vegetative growth and sporulation of Lecanicillium lecanii(ZIMM.) ZARE & GAMS. Compatibility of L, lecanii to different pesticides was found to be varied. Conidial germination was 99.3 and 85.7% in Pongamia oil and acephate, whereas, it was totally inhibited by the presence of chlorothalonil, iprodion + carbendazim, carbendazim and thiophanate methyl indicating that these pesticides were highly toxic. Dinocap recorded as moderately toxic while endosulfan, abamectin and ethion were least toxic based to the germination of conidia. So also Iprodion + carbendazim did not and carbendazim allow L, lecanii to put forth mycelium growth in their presence. Thiophanate methyl, Pongamia oil, acephate, endosulfan, ethion and chlorothalonil were observed to be innocuous pesticides registering growth of mycelium upto 2.33, 2.23, 2.23, 2.03, 2.03 and 2.00 cm dia., respectively from 0.6 cm dia. held in the center of Petri plate on 14th day after treatment. As far as sporulation is concerned, Pongamia oil alone recorded the maximum yield of 47.2 x 106 conidia/ml followed by 18 x 106 conidia/ml, in chlorothalonil as against 20 x 106 conidia/ml in control, which means that the pongamia oil exhibited synergistic effect on L, lecanii, yielding more conidial spores. Thus, based on in vitro interaction study, pongamia oil alone was found to be safe to the entamopathogenic fungus L. lecanii in nature and iprodion + carbendazim and carbendazim were found to be highly toxic.

2007-01-01T00:00:00Z M, Mani A, Krishnamoorthy http://www.erepo.iihr.ernet.in/handle/123456789/204 2010-12-01T14:26:40Z 2006-01-01T00:00:00Z

Title: Colonization of introduced parasitoid, Encarsia guadeloupae Viggiani, on the exotic spiralling whitefly, Aleurodicus dispersus Russell infesting ornamentals Authors: M, Mani; A, Krishnamoorthy Abstract: The exotic spiralling whitefly, Aleurodicus dispersus Russell, was observed to infest several ornamentals including rose, hibiscus, poinsettia and acalypha in and around Bangalore. Efforts were made to colonize the aphelinid parasitoid, Encarsia guadeloupae Viggiani, during 2002-2003 on the above ornamentals infested with the spiralling whitefly. A total of five predators, namely, Axinoscymnus puttarudriahi Kapur and Munshi, Cryptolaemus montrouzieri Muls., Anegleis cardoni (Weise), Mallada astur (Banks) and Cybocephalus sp. were observed on the spiralling whitefly on these ornamentals during the study but there impact on the spiralling whitefly was negligible. Inoculative releases of E.guadeloupae were made on rose (156 adults), hibiscus (179 adults), poinsettia (124 adults) and acalypha (247 adults). Encarsia guadeloupae was recovered within a few month after its release with 3.43 – 32.94% parasitism. A steady decline in the population of spiralling whitefly was observed on these ornamentals. Encarsia guadeloupae was found to be the only parasitoid encountered throughout the study and the total parasitism steadily increased up to 96.00% on rose, 86.40% on hibiscus, 90.40% on poinsettia and 39.86% on acalypha at six months from release. Parasitism by E. guadeloupae was significant and negatively correlated with the population of spiralling whitefly on all the four ornamentals.

2006-01-01T00:00:00Z M, Mani A, Krishnamoorthy http://www.erepo.iihr.ernet.in/handle/123456789/203 2010-12-01T14:27:05Z 2008-01-01T00:00:00Z

Title: Biological suppression of the mealybugs Planococcus citri (Risso), Ferrisia virgata (Cockerell) and Nipaecoccus viridis (Newstead) on pummelo with Cryptolaemus montrouzieri Mulsant in India Authors: M, Mani; A, Krishnamoorthy Abstract: A field study was carried out to determine the efficacy of the Australian ladybird beetle, Cryptolaemus montrouzieri Mulsant, in the suppression of three mealybug species, namely, citrus mealybug, Planococcus citri (Risso), striped mealybug, Ferrisia virgata (Cockerell), and the speherical mealybug, Nipaecoccus viridis (Newstead) on pummelo (Citrus grandis Swingle). C. montrouzieri was released @ 30 larvae/ plant in August 2005 to 2.63/ plant in October 2005, that of F. virgata and from 248.85 to 7.57/ plant and N. viridis from 165.48 to 6.85/ plant in the same period. In the present investigation, a mean of 97.74%, 90.17% and 82.37% reduction in the population of P. virgata and N. viridis, respectively, was recorded 60 days after Cryptolaemus release on pommel.

2008-01-01T00:00:00Z