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Thesis

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1990 - 199961
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Subject: Agricultural Entomology × End date: 1999 × Start date: 1990 × Type: Thesis ×
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Now showing 1 - 9 of 61
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    ThesisItemOpen Access
    STUDIES ON THE INSECT PEST COMPLEX OF MARIGOLD (Tagetes sp.) WITH SPECIAL REFERENCE TO THRIPS CALIOTHRIPS INDICUS BAGNALL (THYSANOPTERA: THRIPIDAE)
    (University of Agricultural Sciences, Dharwad, 1999) SUMBAD, RAMESH S; NAGANAGOUD, A
    Investigations on various aspects covering pest complex on marigold, survey and status of insect pests, seasonal incidence of insects pests, biology of thrips (Caliothrips indicus Bagnall), screening different varieties o f marigold and evaluation of synthetic insecticides and neem products was under taken at the Department of Agricultural Entomology, Agriculture College and Regional Research Station, Raichur, Karnataka during 1997-98. Studies on the surveillance o f various insects pests on marigold revealed five insects belonging to lepidopterist, 12 insects from hemiptera, 12 insects from coleoptera and 10 insects belonging to orthoptera as major, minor or as negligible insect pest at Raichur. Roving survey results revealed that the thrips {Caliothrips indicus Bagnall) incidence on marigold was noticed in all the three districts (Viz., Bidar, Gulbarga and Raichur). The thrips incidence was maximum (7.73 / leaf ) during vegetative stage of marigold at Raichur. The jassids and defoliators (T /- , Helicoverpa armigera Hb. Spodoptera litura F. , ash weevil and grass hopper) were also recorded in all the three districts. Peak incidence of thrips and H. armigera was recorded in all the three districts surveyed. Maximum incidence of thrips and H. armigera was recorded at Raichur and Bidar districts respectively during flowering stage of mangold. The studies on seasonal incidence o f pests of marigold revealed the peak appearance of the thrips between January and May, jassids between October and November and H. armigera during December. To obtain higher flower yield in mangold August, September and October months plantings were found to be suitable. The total life cycle of thrips, C. indicus occupied an average o f 16.80 3.24 days from opposition to adult emergence on marigold and it was 17.90 3.60 days on groundnut. Marigold genotypes screened against several pests, revealed that dwarf red Dharwad, Crimson red tall and Red tall marigold registerd the lower pest population. However, French dwarf marigold was highly susceptible to thrips and H. armigera. Among the twelve synthetic and botanical insecticides tested monocrotophos, dimethpate, acephate, fenvalerate and spinosad were found to be superior to the rest in reducing the sucking pests and H. armigera incidence. Higher yields were obtained from inonocrotophos treated plot followed by dimethoate.
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    ThesisItemOpen Access
    EVALUATION OF FLY ASH IN THE MANAGEMENT OF INSECT PESTS
    (University of Agricultural Sciences, Dharwad, 1999) BADARI PRASAD, P. R.; NAGANAGOUD, A
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON TOXICITY OF PESTICIDES TO EARTHWORMS
    (University of Agricultural Sciences, Dharwad, 1999) MAHANTHA SWAMY, M V; PATIL, B V
    Studies on toxicity of different pesticides to earth worm eudrilus ugeniae by incorporation and topical application method was conducted at Department of Agncultural Entomology, College of Agnculture, Raichur - 584 101 dunng 1998-99. Results indicated that maximum mortality was recorded in case of incorporation method than topical apphcation o f pesticides to food matenal. Among the different pesticides monocrotophos 36 SL, endosulfan 35 EC and qumalphos 20 AF were extremely toxic; glyphosate 48 EC, methylparathion 2% dust dicofol 18.5 EC, paraquat 24 WSL, carbaryl 50% WP were moderately toxic; fenvelerate 20 EC, mancozeb 75 % WP, malathion 5% dust, wettable sulphur 80% WP were less toxic and botamcals were safe to earthworms. Endosulfan 35 EC was found extremely toxic to all the four species of earthworms viz., Eisenia foetida, Pertom’x excavatus, Lampito mauntii and E. eugeniae which caused mortalit>' of more than 50 per cent. The pattern of lethalit}' and extent of mortality of earthworms in carbofuran 3 G, carbendazim 50 WP, trifluralin 48 EC and dicofol 18.5 EC were different with respect to different species of earthworms. Eisenia foetida was less susceptible as compared to other three species of earthworm. Mortality' of earthworm, E. eugeniae was maximum wath treatment 25 per cent higher than the recommended dosage of pesticides viz., carbofuran 3 G, endosulfan 35 EC, carbendazim 50 WP, trifluralin 48 EC and dicofol 18.5 EC as compared to recommended dosage o f above pesticides. There was no significant difference between the reduced dosage treatments. Endosulfan 35 EC recorded longer residual toxicity among different pesticides tested.
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    ThesisItemOpen Access
    STUDIES ON THE PEST STATUS OF LEAFHOPPERS IN GROUNDNUT AND THEIR MANAGEMENT
    (University of Agricultural Sciences, Dharwad, 1999) SRINIVASULU, B V; SOMASEKHAR
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON DIFFERENT MANAGEMENT PRACTICES OF THE SUNFLOWER CAPITULUMBORER, Heliothis armigera (HUBNER) (LEPIDOPTERA: NOCTUIDAE)
    (University of Agricultural Sciences, Dharwad, 1990) BASAVARAJA, G C; DEVARAJURS, K C
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON BIOAGENTS OF SEMILOOPER, Thysanoplusia orichalcea (FAB.) (NOCTUIDAE: LEPIDOPTERA) WITH SPECIAL REFERENCE TO Cantheconidea furcellata (WOLFF.) (PENTATOMIDAE: HEMIPTERA) IN SUNFLOWER
    (University of Agricultural Sciences, Dharwad, 1998) REVANNAVAR, RAVENNA; LAKKUNDI, N H
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON RESISTANCE TO INSECTICIDES IN Spodoptera litura (Fabricius) ON GROUNDNUT
    (University of Agricultural Sciences, Dharwad, 1999) G K, RAME GOWDA; BASAVANA GOUD, K
    Irrespective of the insecticides, maximum loss of sensitivity was observed in Manvi strain (39.09% mortality) followed by Hospet (68.48%) strain which represented high pesticide usage areas. Whereas strains from low pesticide pressured areas were highly sensitive with more than 80.00 percent larval mortality. Irrespective of the strains, maximum loss of sensitivity was for monocrotophos (65.56%) followed by carbaryl (68.89%). Resistance to monocrotophos was highest (8.48 folds) followed by endosulfan (3.30), quinalphos (2.00) and cypermethrin (1.61). Higher levels of resistance, irrespective of the insecticides was noticed from medium (3.80-9.79) and high (4.08- 5.07) pesticide usage areas. The dynamics of resistance to monocrotophos was static from September to February (33.1 2 - 37.66 folds) except during October (44.99). Later the resistance build-up was fast, reaching a peak of 93.1 1 folds during April. Sesame oil, honge oil and pundi oil exhibited higher synergistic action with synergistic ratios of 14.32, 11.97 and 10.85 for cypermethrin and 3.32, 2.84 and 3.41 for monocrotophos, respectively. The pathogenisity of microbial agents, Viz., Spodoptera litura nuclear polyhedrosis virus. Bacillus thuringiensis sub sp. kurstaki and Nomuraea rileyi to susceptible and resistant strains of S.litura remained same. B.thuringiensis and SI NPV were more effective against resistant populations of S.litura by causing 74 and 72 percent larval mortality, respectively compared to quinalphos (60%). N. rileyi was least effective with 34.00 percent larval mortality. Among the new molecules of insecticides tested, polytrin C-44, profenofos and carbosulfan were highly effective causing more than 96 percent larval mortality; whereas cypermethrin was totally ineffective without causing any mortality followed by monocrotophos which caused only 20.00 percent mortality.
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    ThesisItemOpen Access
    STUDIES ON ROCK BEE, Apis dorsata F. AND MANAGEMENT FOR HONEY HARVEST
    (University of Agricultural Sciences, Dharwad, 1999) SATTIGI, HANAMANT N; KULKARNI, K A
    ABSTRACT NOT AVAILABLE
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    ThesisItemOpen Access
    STUDIES ON BIOECOLOGY AND MANAGEMENT OF GROUNDNUT POD BUG (Elasmolomus sordidus F.) (Hemiptera : Lygaeidae)
    (University of Agricultural Sciences, Dharwad, 1999) KULKARNI, VENKATESH S; DESHPANDE, V P
    The bioecology and management of groundnut pod bug (Elasmolomus sordidus) was conducted in field and laboratory at Laxmeshwar and University of Agricultural Sciences, Dharwad, respectively during 1997-98. The population of pod bug in groundnut ecosystem fluctuated between 3.10 to 12.31 per 78.53 sq.cm. Maximum of 30.22 per 78.53 sq.cm was recorded in godown. In addition to crop plants and perennial trees weed host Solanum nigrum was found to harbour the pod bug throughout the year. The average incubation and nymphal period encountered during the study were 7 89, 7.50, 7.32 days and 30.71, 30.53, 27.38 days on groundnut, sunflower and sesamum, respectively. The adult longevity recorded was 15.49, 15.25 and 13.33 days wrth a fecundity rate of 15.4, 15.2, 13.2 on these respective produce. Earwig (Labidura sp.) and cricket (Gryllus sp.) were two predators recorded on pod bug with the maximum population upto 9.00 per half kg of litter and 2.33 per square metre, respectively. Earwig consumed 24.26 eggs and 3.09 adults per day. A similar trend was also noticed in the predatory behaviour of cricket. Sesamum (E-8) was preferred over sunflower by recording maximum bug congregation of 28.54 for 10 days exposure period. Sesamum recorded significantly higher loss of weight and oil content in 30 days exposure compared to sunflower under free choice condition. A study on field and storage loss revealed that stack and store treated with chemical could reduce the pod damage upto 46.24 per cent. The stack treated pods recorded minimum oil reduction (7.45%) as compared stack untreated pods (23.09%). There was no significant differences among groundnut entries screened against pod bug damage. Chlorpyriphos and malathion dust were found superior in the management of pod bug causing mortality upto 90 per cent. Soil treatment with chlorpyriphos and heap treatment with botanicals or chemicals resulted better control over heap treatment alone.