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Subject: Entomology × End date: 1989 × Thesis Type: M.Sc ×
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Now showing 1 - 9 of 34
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    ThesisItemOpen Access
    Evaluation of the toxicity of O,O-diethyl-thiono phosphoric acid O (quinoxalyl (2) ester (sandoz insecticide-6538)to insect pests
    (Division of entomology ,Agricultural college and research institute ,Vellayani., 1970) Gopinathan Nair, P; KAU; Nair, M R G K
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    ThesisItemOpen Access
    Control of nematode parasites of brinjal with insecticide and nematicide granules
    (Division of entomology ,Agricultural college and research institute ,Vellayani., 1970) Vergis, P C; KAU; Mohas Das, N
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    ThesisItemOpen Access
    Studies on the parasitic nematodes associated with vegetables in kerala
    (Division of entomology ,Agricultural college and research institute ,Vellayani., 1968) Ramakrishnan Nair, N; KAU; Mohan Das, N
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    ThesisItemOpen Access
    Studies on the rice swarming caterpillar , Spodoptera mauritia boisduval in Kerala
    (Division of entomology ,Agricultural college and research institute ,Vellayani., 1967) Thomas, B; KAU; M R G K Nair
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    ThesisItemOpen Access
    Studies on the effect of plant nutrient on insect infestation on Abelmoschus esculentus monech
    (Division of entomology ,Agricultural college and research institute ,Vellayani.Trivandrum, 1967) Viswanath, B N; KAU; M R G K Nair
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    ThesisItemOpen Access
    Studies on the toxtcity of insecticide to residues on brinjal to Epilachna vigintioctopunctata fabricius
    (Division of entomology, Agricultural college and research institute, Vellayani, Trivandrum., 1965) Kunjamma Mathew, P; KAU; M R G K Nair
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    ThesisItemOpen Access
    Studies on the effect of refrigeration on the deveolopment of Trichospilus pupivora ferriere (Eulophidae)
    (Division of entomology ,Agricultural college and research institute ,Vellayani., 1964) Narayanan, N J; KAU; Gopalakrishnan Nair, M R
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    ThesisItemOpen Access
    Integrated control of fruit fly Dacus cucurbitae Coq: Trypetidae: Diptera on bitter gourd
    (Department of Entomology, College of Agriculture, Vellayani, 1989) Jalaja, P N; KAU; Remamony, K S
    Bittergourd is very popular among the vegetable growers in Kerala. Fruit flies take a heavy toll of this crop and intense use of pesticides is a common practice of cultivators often leading to serious residue hazards in the marketed fruits. In the present investigation an attempt was made to standardise non-insecticidal methods of control for tackling this pest problem. Laboratory evaluation of potential attractants of fruit flies viz. eugenol, eucalyptus oil, citronella oil, borar, ammonium phosphate, vanilla essence, jaggery, sugar, vinegar, honey, toddy and bittergourd fruits were screened for baiting the adults of D. cucurbitae. Eugenol, eucalyptus oil, citronella oil, borax, ammonium phosphate and vanilla essence did not show any attractiveness to the flies. Three graded concentrationsof honey, sugar, jaggery, toddy and vinegar were tested for their attractiveness to the files in the laboratory. The result showed that (1) honey at the highest concentration of 1% attracted the maximum number of flies (2) toddy was not effective for attracting D. cucurbitae. (3) immature stages of bittergourd fruits showed poor aatraction and (4) ripe bittergourd fruits showed poor attraction and (4) ripe bittergourd fruits showed maximum attraction to the files up to 12 h of exposure.
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    ThesisItemOpen Access
    Use of synthetic pyrethroides for the control of pests of bitter gourd (Momordica charantia L) and snake gourd (Trichosanthes anguina L)
    (Department of Entomology, College of Agriculture, Vellayani, 1982) Kosaraju Ravindra, Nath; KAU; Sasidharan Pillai, K
    In a field experiment conducted at the Instructional Farm, College of Agriculture, Vellayani, during the summer season in 1982, the efficacy of four synthetic pyrethroids viz. permethrin, fenvalerate, cypermethrin and deltamethrin, on the pests of bitter gourd and snake gourd in comparision with the standard, malathion, was evaluated. Both the crops were sprayed thrice on need basis for controlling the various pests which infested the crops at different growth stages. Spotted beetle observed on bitter gourd at the time of first spraying was controlled by all the synthetic pyrethroids along with the standard for a period of 23 days after spraying. Fruit fly of the bitter gourd also was controlled by all the three sprayings and all the insecticides were effective in most occasions. Cypermethrin at higher dose was superior to the standard during the first spraying followed by fenvalerate and deltamethrin. In the second spraying deltamethrin was not so effective whereas permethrin was found more effective. Again in the third spraying deltamethrin and fenvalerate were more effective . The fruit fly damage observed for the entire crop season revealed the superiority of fenvalerate, permethrin and deltamethrin at their higher doses over the standard. Jassid on bitter gourd was controlled by all the insecticides except permethrin and cypermethrin at their lower dose for a period of 2 days after the spraying . But aphid could be controlled only with permethrin and fenvalerate at their higher dose along with the standard malathion for a period of 2 DAS. The fruit set and the flowering pattern were not affected by any of these insecticides.