Reprints
Permanent URI for this collectionhttp://localhost:4000/handle/123456789/1975
Browse
19 results
Search Results
Item On the occurrence of Teleonemia Scrupulosa stal. (Hemiptera Tingidae) on lantana from Kerala(Kerala Agricultural University, 1977) Joy, P JItem Advantages, disadvantages and the possibilities of the utilization of brachymeria parasites for the biological control of Nephantis Serinopa, the black-headed caterpillar pest of coconut(Kerala Agricultural University, 1977) Joy, P J; Joseph, K JThis paper deals with the advantages and disadvantages of utilizing Brachymeria (Neobrachymeria) nosatoi and B. nephantidis as agents for the biological control of Nephantis serinopa.Item On the occurrence of Nisia Atrovenosa Lethierry (Homoptera : Menoplidae) on Pistia stratiotes Linn. (Fam. Araceae) in India(Kerala Agricultural University, 1978) Joy, P JItem Biology of Brachymeria Nephantidis Gahan and Brachymeria Lasus (walker) (Hymenoptera : Chalcididae)(Kerala Agricultural University, 1978) Joy, P J; Narendran, T C; Joseph, K JThe detailed biology of Brachymeria nephantidis and Brachymeria Insus, two important, pupal parasites of the black headed caterpillar of coconut Nepliantis serinopa has been studied and the results are reported in this paper.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 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 Population fluctuations of aphid pests of Chromolaena Odorata (Eupatorium Odoratum) in Kerala(Kerala Agricultural University, 1985) Lyla, K R; Joy, P J; Abraham, C CIn studies on the population fluctuations of the aphidpesfsof Chromolaena odorata Linn, in the plains and medium hilly localities of Trichur district (Kerala State), it was found that Aphis spiraecola Patch and Aphis fabae Scopoli occurred at peak levels in July in both situations, the diversity of occurrence per unit area being also higher in July. Brachycaudus helichrysi KItb. occurred at higher elevations of the Idukki, Wynad districts causing complete damage to the plants. Nymphs and adults of A. spiraecola and A. fabae fed on tender leaves and shoots causing severe leaf crinkling. Consequent on feeding by B. helichrysi the leaves became rolled and the entire plants showed wilting symptoms. As candidates for the bio-control of C. odorata in Kerala, these aphids do not appear to be quite promising.Item New record of Leptoglossus Australis (Fabr) as a pest of Bittergourd in Kerala(Kerala Agricultural University, 1986) Lyla, K R; Joy, P J; Peter, K VItem Occurrence of Cosmopolites sordidus (Germar) as an internal borer in banana peduncles(Kerala Agricultural University, 1986) Job Sathyakumar Charles; Abraham, C C; Joy, P J; Varkey, P A