Browsing by Author "Sujatha, A."
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Item Acceptance of dry baits by common mice of North Malabar(2007-02-08) Keshava Bhat, S.; Sujatha, A.Item Biology and control of Rattus rattus wroughtonii Hinton, a pest of coconut in India(1993) Keshava Bhat, S.; Vidyasagar, P.S.P.V.; Sujatha, A.Item The coconut leaf caterpillar, Opisina arenosella Walker(2006) Chandrika Mohan; Sujatha, A.Item Crow - Pheasant and Red Palm Weevil(2004-05) Ponnamma, K.N.; Rohini Iyer; Raidu, B.T.; Leena, S.; Sujatha, A.Item Effect of saturation baiting using multiple dose anticoagulants on the population of black rat in coconut fields(1988-01) Keshava Bhat, S.; Sujatha, A.Item Effect of saturation baiting using multiple dose anticoagulants on the population of black rat in coconut fields(2007-02-08) Keshava Bhat, S.; Sujatha, A.The effect of sustained baiting; with multiple dose anticoagulant such as warfarin and fumarin in re-, ducing the populations of the black rat, Rattus rattus wroughtonl in coconut gardens was studied One time and two times baiting) have reduced the population and damage by nearly 50 per cent and 70 per cent respectively. Continu-ous baiting for three times has reduced the population by 94 par cent and damage by cent per cent The cost involved for three times baiting was not much when com-pared to the" returns from the operation.Item Evaluation of brodifacoum against the Indian black rat Rattus rattus wroughtoni in cocoa(2007-02) Keshava Bhat, S.; Sujatha, A.Brodifacoum, a second generation single dose anticoagulant, was evaluated against the black rat, Rattus rattus wroughtoni Hinton, a major rodent pest of cocoa in South India. Laboratory feeding trials using brodifacoum (0-005%) wax blocks showed cent per cent mortality in these rats by 1 day feeding. The active ingredient consumed varied from 0-35 mg to 9-17mg/kg body weight (mean 3-71 ± 0-53 mg/kg). The mortality occurred from the third day to the tenth day of feeding with a maximum on the fifth day in females and on the sixth day in males. One, two and three baitings with brodifacoum baits at intervals of 10 days between baitings reduced the rat population by 76%, 95% and 97%, respectively in cocoa gardens. Moreover, cent per cent reduction in the damage was achieved by two baitings itself.Item Evaluation of Different Cultivars of Coconut (Cocos nucifera L.) at Tender Nut Stage(1999) Attri, B.L.; Sharma, T.V.R.S; Suryanarayana, M.A.; Sujatha, A.Item Field evaluation of two pheromones lures against red weevil,(Rhynchophorus Ferrugineus Oliv.) in coconut gardens in Andrapradesh(2006) Sujatha, A.; Chalapathi Rao, N.B.V.; Rao, D.V.R.Item Field Studies on Rhinolure Trap in the Control of Rhinoceros Beetle (Oryces Rhinoceros) in Coconut(2002) Sujatha, A.; Nair, C.P.R.K.; Rao, D.V.R.The adult rhinoceros beetle damages the coconut palm by boring into tender and soft tissue of bud region i.e., unopened leaves and spathes resulting in the reduction of yield up to 10 per cent. Sometimes, it acts as a carrier for bud rot disease and also pre disposes the palm to the attack of red palm weevil. Although chemical control remains the most effective control measure to date, current emphasis is mainly on the use of eco friendly measures like bio control agents, plant origin pesticides, pheromones etc., with an aim of reducing the use of chemicals for control. The major effect of Integrated Pest Management has been to reduce pesticide use to very low level. Studies with 0. rhinoceros have helped to identify an active compound i.e., aggregation male pheromone (ethyl 4 - methyl1 - octanoate) and opens up new prospects for controlling the pest effectively. Hence, present studies were carried out to test the efficacy of the pheromone in reducing the beetle damage, as this has direct impact on the pest build up in the field.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.Item Laboratory Evaluation of two Anticoagulants against Rattus Rattus Wroughtoni Hinton(2007-02) Keshava Bhat, S.; Sujatha, A.Warfarin and fumarin are the two anticoagulant rodentkides available in India for rodent control operations. The toxlcity and relative acceptability of these poisons to the black rat, Ratios rattus wroughtoni Hinton, an important rodent pest of coconut and cocoa in South India were evaluated in the laboratory. There was no significant difference in the toxicity between these poisons (LFP50 around 4 days for both (he poisons) to R.F. wroughtooi, but there was much difference in their acceptance. After consuming the poison baits, the animals started dying from the third day onwards. The peak mortality was on the fifth day for warfarin and the seventh day for fumarin. Cent per cent mortality was achieved within 12 to 14 days feeding. However the baits mixed with fumarin were preferred significantly to those mixed with warfarin and hence recommended to use such poison bait continuously for two weeks in the field.Item Light trap - induced suppression of coconut slug caterpillar, Macroplectra nararia Moore menace in East Coast of India(2011) Sujatha, A.; Emmanuel, N.; Arul Raj, S.Item Monitoring and Management of Coleopteran pests of Coconut through Pheromone traps in Andhra Pradesh(2010-03) Sujatha, A.; Chalam, M.S.V.; Arulraj, S.Among the insect pests ofcoconut, the red palm weevil Rhynchophorus ferrugineus and rhinocero~ beetle, Oryctes rhinoceros are reckoned as important. Roving survey made in eight coconut growing districts of Andhra Pradesh during the years 2000 to 2008 showed low to medium incidence of rhinoceros beetle in all the districts and severe incidence ofred palm weevil in East Godavari district. This information on relative severity of the two pests was useful to guide in suitable interventions for integrated pest management. Efficacy of pheromone lures of rhinoceros beetle (Ethyl 4-methyl octonoate) and red palm weevil (4 methyl -5 -nonanol) from different sources were tested. There were distinctly high catches of rhinoceros beetle recorded in rhino lure during April, May, June, September and October months, while red palm weevil lures recorded higher catches of weevils in March, April, May, June and July months. Among the sources compared, rhino lure appeared superior for trapping rhinoceros beetle, while the red palm weevil lure from CPCRI, Kayangulam proved superior against red palm weevil. Trapping and destruction ofrhinoceros beetle through pheromone traps resulted in the reduction of leaf and spindle damage by 27.3 and 59.9%, respectively. Use of pheromone trap for red palm weevil was found to effectively reduce the palm damage by 78% and 93% dead palms.Item Natural enemy complex of coconut leaf eating caterpillar, Opisina arenosella Walker (Lepidoptera: Xylorictidae) in Karnataka(2007-02) Sujatha, A.; Singh, S.P.Surveys in coastal and interior Karnataka during 1996 and 1997 revealed the occurrence of four larval, one larval-pupal and thirteen pupal parasitoids and eleven predators of Opisina arenosella Walker. Eight hyperparasitoids were also recorded.Item Olfactory conditioning in Goniozus nephantidis (Musebeck) a parasitoid of coconut black headed caterpillar, Opisina arenosella Walker(2007-02) Subaharan, K.; Raveendran, P.; Md. Basheer, B.; Sujatha, A.; Ponnamma, K.N.Egg maturation and behavioral response to imaginal conditioning was studied on bethylid, Goniozus nephantidis, a parasite of coconut black-headed caterpillar, Opisina arenosella. Age and feeding had influence on G. nephantidis reared on O. arenosella. Eclosed females of 0-24 h had no mature eggs. Maximum numbers of mature eggs in the abdomen were observed 10 days after eclosion. Parasitoids that emerged from Corcyra cephalonica when offered a choice to parasitize C. cephalonica and O. arenosella showed preference to C. cephalonica, the host on which it was reared (Unconditioned response). Though unconditioned, they had 32 per cent response to O. arenosella and this is termed innate response. But when they were conditioned to odour of O. arenosella and then provided a choice, they preferred to parasitize O. arenosella as compared to C. cephalonica. Hence, it is clear that attraction to odours in imago that develops after eclosion is partly induced and partly Constitutive. © 2005 Association for Advancement of Entomology.Item The Palm Civet: A Pest of Cocoa(2007-02) Keshava Bhat, S.; Sujatha, A.; Thomas, K.G.Item Population structure and breeding season in Rattus rattus wroughtoni Hinton(2007-02) Keshava Bhat, S.; Sukumaran, A.S.; Advani, R.; Sujatha, A.Observations were made from July 1982 to June 1985 on certain aspects of the population ecology of Rattus rattus wroughtoni Hinton. Altogether 2639 specimens of rats were collected. The male to female ratio was 0-87:10. Male rats were significantly heavier and bigger than the females. Pregnant female rats were encountered throughout the year with two peaks, one during early summer (February-March) and the other during monsoon (July-August). The incidence of pregnancy was lowest in May when the day temperature was maximum. The litter size ranged from 1-8. The pre-implantation loss was 0-75 ovum per female.Item Population structure and breeding season in Rattus rattus wroughtoni Hinton(1987-11) Keshava Bhat, S.; Sujatha, A.; Advani, R.; Sukumaran, A.S.Observations were made from July 1982 to June 1985 on certain aspects of the population ecology of Rattus rattus wroughtoni Hinton. Altogether 2639 specimens of rats were collected. The male to female ratio was 0-87:1-0. Male rats were significantly heavier and bigger than the females. Pregnant female rats were encountered throughout the year with two peaks, one during early summer (February-March) and the other during monsoon (July-August). The incidence of pregnancy was lowest in May when the day temperature was maximum. The litter size ranged from 1-8. The pre-implantation loss was 0-75 ovum per female.