Browsing by Author "ARUNKUMAR HOSAMANI"
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ThesisItem Open Access BIO-ECOLOGY AND MANAGEMENT OF YELLOW MITE, Polyphagotarsonemus latus (Banks) ON Bt COTTON(2012-06-30) RAMYA, P.R.,; ARUNKUMAR HOSAMANIInvestigations were carried out on biology, seasonal incidence, screening of Bt cotton hybrids and management of yellow mite, Polyphagotarsonemus latus (Banks) with new acaricides at the Department of Agricultural Entomology, College of Agriculture and Main Agricultural Research Station, Raichur, Karnataka during 2011-12 kharif season. Eggs were laid singly on the under surface of leaf, but under crowded conditions they were found on upper surface of leaf. The duration of egg ranged from 2.02 to 2.38 days with a mean duration of 2.07 days and the mean duration of quiescent (resting) stage was 1.42 days. The pre-oviposition, oviposition and post-oviposition periods lasted for 1.31, 7.92 and 1.24 days, respectively. The fecundity was 17.04 to 27.81 eggs with a mean of 5.18 ± 1.12 eggs per day per female. The females lived for a period of 15.66 days while the male longevity lasted for 14.62 days. The length and width of egg, larva, nymph, and quiescent larva was 109.32 ± 4.28 and 72.19 ± 2.14 μm, 154.87 ± 16.41 and 92.68 ± 9.63 μm, 167.45 ± 14.87 and 92.88 ± 13.84 μm and 187.78 ± 10.22 and 114.41 ± 14.60 μm respectively. Irrespective of date of sowing the peak activity of mite was noticed during fourth week of August and first week of September. Correlation studies indicated that maximum temperature showed negative non significant correlation while minimum temperature, rainfall and rainy days showed positive non significant. Screening of 14 cotton hybrids against yellow mite revealed that only MRC 7347 and MRC 7351 were recorded minimum yellow mite population compared to other Bt cotton hybrid. Among the pesticides evaluated fenpyroximate 5 SC @ 25 g.a.i/ha and propargite 50 EC @ 500 g.a.i/ha was found to be superior over other chemicals. Highest net returns of Rs. 76590/ha was recorded in fenpyroximate 5 SC @ 25 g.a.i/ha.ThesisItem Open Access FAUNASTIC STUDIES ON NATURAL ENEMIES OF FALL ARMYWORM, Spodoptera frugiperda (J. E. SMITH) (LEPIDOPTERA: NOCTUIDAE) WITH SPECIAL REFERENCE TO EVALUATION OF EGG PARASITOIDS(2023-12-26) VEENA K; ARUNKUMAR HOSAMANIFaunastic studies on natural enemies of fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) with special reference to evaluation of egg parasitoids were carried out at MARS, UAS, Raichur during 2019-20. Roving survey conducted in five major districts of North Eastern Karnataka viz., Ballari, Kalaburgi, Koppal, Raichur and Yadgir and 18 natural enemies were recorded on fall armyworm (FAW) viz., Trichogramma sp. (42.65 %), Telenomus sp. (29.37%), Chelonus sp. (0.17 %), C. formosanus (0.96 %), Coccygidium sp. (2.48 %), Cotesia sp. (0.21 %), C. chloridae (0.21 %), unidentified ichneumonid (0.26 %), Euplectrus sp. (0.08 %), E. xanthaspis (18.43 %), Archytus sp. (0.39 %) and two entomopathogens viz., M. rileyi (7.51 %) and SpfrNPV (2.79 %). The biology studies of four different egg parasitoids viz., T. pretiosum, T. chilonis, T. bactrae and T. remus revealed that the highest developmental period of 10.00 ± 0.05 was noticed in T. remus followed by T. chilonis (9.30 ± 0.32 days) and T. pretiosum (9.00 ± 0.02 days). Highest adult longevity was noticed in T. remus (8.10 ± 0.01 and 11.58 ± 0.51 days) followed by T. chilonis (6.02 ± 0.19 and 8.20 ± 0.80 days) for both male and female. The impact of age of the host egg (24, 48 and 72 h) revealed that the parasitoids preferred freshly laid eggs (24 h old) for parasitisation. The highest parasitism was observed in T. pretiosum (97.40 %) followed by T. chilonis (97.00 %). The maximum adult emergence was noticed in T. chilonis on 24 h old eggs (98.96 %) and it declined as the age of the host egg advanced. Similarly the influence of age of the female parasitoid over parasitisation revealed that one day old females recorded maximum parasitism (98.60 %) and adult emergence (98.97 %) in T. pretiosum, while in T. remus, the highest rate of parasitism and adult emergence was noticed in six day female (83.80 and 98.79 %). The evaluation of different densities (50,000, 1,00,000 and 1,50,000/ha) of T. pretiosum to contain the S. frugiperda in maize revealed that the release of 1,00,000 parasitoid per hectare was the most suitable for its effective management.ThesisItem Open Access STUDIES ON THRIPS SPECIES COMPLEX AND ITS MANAGEMENT IN CUCURBITS(UNIVERSITY OF AGRICULTURAL SCIENCES RAICHUR - 584 104, 2018-10-30) VISHAL KUMAR, V.; ARUNKUMAR HOSAMANIThesisItem Open Access SURVEY AND BIOECOLOGY OF TOMATO LEAFMINER, Tuta absoluta MEYRICK (LEPIDOPTERA: GELECHIIDAE) IN NORTH EASTERN KARNATAKA(UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR, 2016-06-30) MANOJ KURANE; ARUNKUMAR HOSAMANIStudies on survey and surveillance, monitoring and biology of tomato leafminer, Tuta absoluta (Meyrick) were carried out at Main Agricultural Research Station (MARS), University of Agricultural Sciences, Raichur, during 2015-16. Roving survey conducted in six districts of North Eastern Karnataka viz., Bidar, Kalaburagi, Yadgir, Raichur, Ballari and Koppal indicated that maximum numbers of larvae were noticed in Kalaburagi district. The associated predator of tomato leafminer population was high in Raichur, while it was low in Koppal district. Maximum parasitoids (Habrobracon sp. and N. formosa,) were noticed in Raichur district. Per cent leaf and fruit damage was high in Kalaburagi district during vegetative and fruiting stage. In MARS, Raichur both maximum and minimum temperatures had positive and significant correlation (r = 0.67 and 0.72) on the population of tomato leafminer, whereas negative and significant relationship was established between population and morning and evening relative humidity (r = -0.80 and -0.61). Correlation studies on light trap catches of moths with maximum and minimum temperatures showed negative and significant correlation (r = -0.50 and -0.60). On contrary, both maximum and minimum temperature had no influence on pheromone trap catches of moths (r = 0.06 and -0.43). However, evening relative humidity had positive and significant correlation (r = 0.52). Studies on biology of tomato leafminer conducted at laboratory revealed that the incubation period of T. absoluta eggs lasted for 4.08 ± 0.55 days. The total larval period required 10.59 ± 2.06 days to complete its development. The pupal period occupied 7.62 ± 1.07 days. Adult females laid 165.05 ± 6.22 eggs per female. The longevity of male moths varied with 7.50 ± 1.20 days, while that of female 15.01 ± 1.47 days. The percentage hatchability of 90.67 per cent was recorded. Fecundity was observed from first to thirteenth day, wherein the highest fecundity was recorded on second day with 40.70