Browsing by Author "Rajan, P."
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Item Adoption of Integrated Pest Management Strategies for Sustainable Production in Coconut(2011-04) Nair, C.P.R.; Rajan, P.; Namboothiri, C.G.N.Item Another invasive pest, coconut leaf beetle, Brontispa longissima (Gestro), an imminent biosecurity threat at the doorsteps of India(2012-08) Rajan, P.; Nair, C.P.R.; Josephrajkumar, A.; Chandrika MohanItem Biology of Campsomeriella collaris Fab., a Natural Enemy of the Coconut White Grub, Leucopholis coneophora Burm.(2010) Chandrika Mohan; Rajan, P.Item Biology of Pentalonia nigronervosa F. Caladii Van der goot, vector of Katte disease of cardamom(2007-02-08) Rajan, P.In cardamom (Elettarla cardamomum Mat on), the aphid Pentalonia nigronervosa 1. catadii van der Goot was found in small colonies underneath the leaf sheaths of older or partially dried pseudostems. The aphid is viviparous and reproduces partheno-genetically. It completes its life cycle in 10-15 days with four instars. The longevity of the adult ranges from 8 to 26 days, with 26-36 overlapping generations during an year under Coorg conditions. The percentage of transmission of katte virus showed a positive correlation with the increase in the age of the nymph. In the field, winged (alate) forms of the aphid were found maximum during December - May. In addition to cardamom, the aphid was found breeding on plants like Colocasia sp., Alocasta sp. and Caladtum sp. The Coccinellid beetles Pullus sp. and Coccinella transversalis and maggots of Syrphid flies Ischiodon scutellaris, Paragus tibialls and Episyrphus viridaureus and an unidentified Hemorobiid were recorded as predators of this aphid.Item Coconut Eriophyid Mite Aceria guerreronis Keifer-An Overview(2005) Nair, C.P.R; Rajan, P.; Chandrika MohanItem Coconut Eriophyid Mite,Aceria guerreronis Keifer(2003) Rajan, P.; Chandrika Mohan; Josephrajkumar, A.Item Coconut leaf Beetle(Brontispa longissima)-An inavasive pest of concern(2009-10) Rajan, P.; Nair, C.P.R.; Josephrajkumar, A.; Chandrika MohanItem Coried bug of coconut(2005-10) Rajan, P.; Nair, C.P.R.Item Description of the salivary gland of the lace bug: Stephanitis typica (Distant)(2007) Mathen, K.; Rajan, P.; Radhakrishnan Nair, C.P.Item Description of the salivary gland of the lace bug: Stephanitis typica (Distant)(2007-02-08) Mathen, K.; Rajan, P.; Radhakrishnan Nair, C.P.Item Distinguishing palm aphid and arecanut whitefly, two emerging pests in palms(2013-06) Josephrajkumar, A.; Rajan, P.; Chandrika Mohan; Namboothiri, C.G.N.Item Diversity and management of scale insects infesting coconut(2011-01) Josephrajkumar, A.; Rajan, P.; Chandrika Mohan; Namboothiri, C.G.N.Item Effect of insecticides on transmission and acquisition of katte virus of small cardamom and their use in relation to disease spread and vector control(2007-02-08) Rajan, P.; Naidu, R.; Venugopal, M.N.Thirty four insecticides were evaluated against nonpersistent aphid borne Katte virus to determine their effect on transmission and acquisition under laboratory conditions. Transmission results showed that none of the insecticides tested was effective on acquisition and transmission of virus even on the day of spraying. Investigations were also carried to find out the feasibility of using systemic and contact insecticides for control of vector and disease. Regular application of insecticides such as Phosphamidon, Carbofuran and Phorate resulted in significantly more disease spread than control. But in the Methyl parathion, Dimethoate and Quinalphos treated plots the disease incidence was on par with control. However, suppression of aphid pupulation build up was significantly less in all insecticide treated plots.Item Effect of systemic soil insecticides and a plant product in microbial load of soil in root (wilt) affected coconut monocropping ecosystem(2007-02-08) Murali Gopal; Alka Gupta; Rajan, P.; Radhakrishnan Nair, C.P.The changes undergoing in the microorganism population due to the application of phorate 10G, carbofuran 3G (@ 10 g a.i./ palm) and neem oil cake (@ 1.5 kg / palm) in the basin region of coconut growingsn root (wilt) affected area was studied. Generally, a high microbial, population was observed in the control plot. Carbofuran proved to be more toxic as compared to phorate as it suppressed the bacterial, actinomycetal, and free-living N2 -fixers number significantly. Against Nitrosomonas and Nitrobacter (nitrifiers), the influence was inconsistent. Neem oil cake enhanced bacterial and free-living N2-fixer count ; against actinomycetes and fungi there was an initial stimulatory, and then antagonistic impact, whereas, it proved detrimental to the nitrifiers. From the six soil samplings done, spread over a period of six months, the microbial load was recorded to be high whenever there was moderate rainfall and medium temperature. Application of neem oil cake produced positive effect on the beneficial microorganisms as compared to the systemic insecticides.Item Electron microscopic evidence on the role of Stephanitis typica (Distant) as vector of coconut root (wilt) disease(1987-12) Mathen, K.; Solomon, J.J.; Rajan, P.; Geetha, L.Item Electron microscopic evidence on the role of Stephanitis typica (Distant) as vector of coconut root (wilt) disease(2007-02-08) Mathen, K.; Solomon, J.J.; Rajan, P.; Geetha, L.Item Etiology - Phytoplasma(2007-02) Solomon, J.J.; Nair, C.P.R.; Rajan, P.; Srinivasan, N.; Govindankutty, M.P.; Mathen, K.; Pillai, N.G.Item Farmer friendly production technology of the green muscardine fungus for the management of rhinoceros beetle(2010-11) Chandrika Mohan; Rajan, P.; Nair, C.P.R.; Sunny Thomas; Anitha Kumari, P.Item First record of Asian grey weevil (Myllocerus undatus) on coconut from Kerala, India(2010) Josephrajkumar, A.; Rajan, P.; Chandrika Mohan; Thomas, R.J.The occurrence of Asian grey weevil Myllocerus undatus (Curculionidae: Coleoptera) damaging coconut (Cocos nucifera L.) seedlings is reported for the first time from Kerala, India. A mild to moderate level of infestation damaging 5–10% leaf lamina of un-split leaves with a typical notching-like symptom along the leaf margins is noticed on the majority of the coconut seedlings belonging to different coconut varieties, viz., ‘Chowghat Orange Dwarf’, ‘Chowghat Green Dwarf’, ‘Malayan Green Dwarf’, ‘West Coast Tall’ and Dwarf x Tall hybrids. M. undatus has not been reported as a destructive pest on any of the crops from India and is considered to be a pest of quarantine significance. Adult weevils have a characteristic tri-spined hind femur and elytra strongly angled broader than the prothorax.Item Gradient Outbreak of Coconut Slug Caterpillar, Macroplectra narada Moore in East Coast of India(2011) Rajan, P.; Josephrajkumar, A.; Sujatha, A.Gradient outbreak of coconut slug caterpillar. Macroplectra nararia Moore (Limacodidae: Lepidoptera) in East Godavari district, Andhra Pradesh during April-May 2009 is closely interlinked with rise in ambient temperature and humidity along the water bodies. This favoured large scale explosion of pest population leading to widespread damage in coconut plantations ranging from 9095% in severely affected gardens, indicating the sporadic nature of the pest. Exacerbation by grey leaf blight fungus, Pestalotiopsis palmarum accelerated the damage causing rampant scorching of coconut leaflets in pest affected gardens. In the field, some caterpillars were found infected by entomopathogens. Light trapping is suggested as an effective monitoring tool and a feasible mechanical control strategy of the pest.
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