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Item Relative systemic toxicity of some insecticides to the brown plant hopper when applied as granules in soil(Kerala Agricultural University, 1975) Thomas, M I; Kunjamma, P Mathew; Abraham, C C; Nair, M R G KItem Biology and predatory potential of coccinella arcuata fabricius (coccinellidae : coleoptera) a predator of the brown plant hopper nilaparvata lugens stal.(Kerala Agricultural University, 1975) Abraham, C C; Kunjamma, P MathewThe details of biology and feeding capacity of Coccinella arcuata Fabr,, a predator of Nilaparvata lugens stal were studied under laboratory conditions at 28 ± 1.5° C and 80 ± 2% RH, The mean fecundity was 210 per female. The incubation period of eggs lasted for 3 days. There are four larval instars occupying 12 days followed by a pupal period of 5 days. The total life span from egg to adult emergence lasted for 20 days. The different stages in the life cycle have been discribed. On an average the freshly emerging first iru.tar grub ate first and second instar nymphs of N- lumens at 15 per day. The second, third and fourth larval instars and the adults consumed all nymnhal stages of the host at 18, 25, 27, 29 per day respectively. The adults occasionally feed on adult hoppers. The predatory population was maximum during February - March occurring on the 'Punja' rice crop.Item Occurrence of Ichthyura Restitura Walker (Notodontidae: Lepidoptera) as a serious pest of lovi-lovi, Flacourtia inermis Roxb(Kerala Agricultural University, 1978) Abraham, C C; Remamony, K SItem Toxicity of newer insecticides to the coconut caterpillar Nephantis Serinopa Meyr and its parasite Bracon Brevicornis Wesmeal(Kerala Agricultural University, 1978) Kunjamma P Mathew; Nair, M R G K; Abraham, C CThe LD 50 levels of toxicity of phosalone, endosulfan, malathion, quinalphos, fenthion, phosphamidon. monocrotophos, fenitrothion, dichlorvos, BHC and carbaryl to 4th instar larvae of the coconut caterpillar Nephantis seringa were 0.02428, 0,02925, 0.05288, 0.05614, 0.08416, 0.09477, 0.09833, 01013, 0.1639, 0.2920and 0.4990 respectrvely. Toxicity of residues of dichlorvos 0.05%, fenitrothion, 0.05%, malathion 0.05% on coconut leaves to 1st instar larvae of N. serhwpa had become negligible on the 8th day of their application and that of residues of quinaiphos 0.05%, phoslone 0.05% and BHC 0.2% on the 16th day of application; residues of carbaryl 0.2%, and monocrotophos 0.02% showed toxicity beyond 16 days. Toxicity of residues of the same concentrations of dichlorvos, fenitrothion, fenthion, endosulfan and phosphamidon on coconut leaves to adults of Bracon brevicomis had become negligible in 8 days of application and that of residues of malathion, quinaiphos, phosalone and BHC in 16 days of application; residues of monocrotophos and crabaryl remained toxic to parasites beyond 16 days.Item On the occurrence of different species of rats in Kerala(Kerala Agricultural University, 1980) George, C M; Joy, P J; Abraham, C CItem Regulation of fecundity, progeny production and female-male composition of Bracon Brevicornis Wesmael (Hymenop Tera : Braconidae)(Kerala Agricultural University, 1980) Sosamma Jacob; Abraham, C C; Joy, P JThe fecundity, progeny production, female-male ccmposition offhe progeny of Bracon brevicorn/s Wesmael as influenced b/ density and weight of host larvae of Corcyra caphalonica Stainton and the sex-ratio of the parent parasite population were studied at three temperature-humidity combinations, namely, 28°C-75% RH (TH,), 30aC-60% RH (THJ and 32°C-50% RH {TH3) • The effect of the main factors on parasite development was found to be modified by the temperature humidity conditions of rearing. The maximum fecundity of the parasite was registered consistently at all the three TH levels at a host density level of two larvae per female parasite and when the parental parasite sex ratio was kept at 2.1 and 3:1 (femalermale). The highest progeny production was attained at the THt and TH^ levels under a host density le/e! of two heavie' (30-35 mg) larvae per female parasite, The influence of host larva! density on the proportion of females was pronounced only at the TH^ level and a density of two larvae per female parasite was found to be better for the production of higher proportion of females. The parental sex-ratios of 1:3 (female : male) produced higher proportion of females at the THLJ and TH3 levels.Item Cantheconidea Furellata (Wolf) Pentatomidate:Hemiptera As a predator of Henoseplachna Vigintioctopunctata (Fabr)(Kerala Agricultural University, 1981) Sheila, M K; Abraham, C CItem Studies on Rattus Norvegicus berkenhout in Kerala(Kerala Agricultural University, 1981) George, C M; Joy, P J; Abraham, C CIn a survey conducted during 1978-79, Ftattus norvegicus Berkenhout was found to be widely distributed in Kerala. This rat constructed two types of burrows, one with long system and the other of shorter nature. A comparison of the fatures of these two types are given. This species inhabits farm lands and cause damage to paddy crop upfo the booting stage by cutting the plants at ths base.Item Effect of neem leaf extract and two JH analogues on the development of Callosobruchus Chinensis Linn. (Coleoptera:Bruchidae)(Kerala Agricultural University, 1981) Ambika, B; Abraham, C C; Nalinakumari, TIn studies on the comparative effectiveness of neem extract and the juvenile hormone analogues Hydroprene (ZR-512) and MV-678 against Callosobrucbus chinensis, it was found that in greengram seeds treated with 0.25 wg of Hydroprene, there was significant reduction in fecundity and progeny production of the insect. The neem leaf extracts at 2.5 and 5.0% and MV-678 at 0.5 ug were as effective as Hydroprene in suppressing progeny production. The feasibility of utilising JH analogues and neem leaf extracts for the management of C, chinensis has been discussed.Item Food preference of the rice meal moth Corcyra Cephalonica Stainton (Lepidoptera : Pyralidae)(Kerala Agricultural University, 1981) Ambika, B; Abraham, C C; Dale, D