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2016 - 201912020 - 20231
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Subject: Entomology × Author: Manisha ×
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    ThesisItemOpen Access
    Evaluation of promising desi cotton (Gossypium arboreum L.) genotype and insecticidal management of bollworm complex
    (CCSHAU, Hisar, 2023-04) Manisha; Rolania, Krishna
    The present study was conducted at Chaudhary Charan Singh Haryana Agricultural University, Hisar, Haryana (India). Effect of different sowing time, varietal screening, insecticidal management and avoidable yield loss etc. were studied against bollworms in cotton during 2018 and 2019. In the variety, HD 432 (desi) incidence of bollworms namely, Earias spp (Earias insulana & Earias vittella), and Pectinophora gossypiella Saunders was high in May sown cotton (14th May) as compared April sown cotton (12th and 27th April). Weather parameters like minimum temperature, evening relative humidity and wind speed showed significant negative correlation with spotted bollworm and pink bollworm damage. Twenty one genotypes were screened during 2017 and 2018 and green bolls damage was recorded minimum in genotype IET (2) 5 against spotted bollworm (8.87 and 9.93%, respectively) and pink bollworm (0.67 and 0.80%, respectively) bollworm. While genotype CISAA 6 was observed with maximum incidence of spotted bollworm (15.91 &18.16%) and pink bollworm (4.13 & 4.80%) during 2018 and 2019, respectively. Bollworms incidence showed negative significant correlation with rind thickness, total soluble sugar and tannin content while positive significant correlation was observed with total phenol content and crude protein in seeds. During 2018 and 2019 twenty insecticidal treatments with control was evaluated against bollworms damage. Treatment T17 (spray of spinosad 45 EC initiated at 25% square formation) was found highly effective with minimum SBW damage (6.74 & 7.36 %) in green bolls that was statistically at par with T18 (spray of Spinosad 45 EC initiated at initiation of boll formation) (7.23 & 7.97%), T13 (spray of Thiodicarb 75 WP initiated at 25 % square formation) (7.33 & 7.95%) and T5 ( Spray of Bifenthrin 10 EC initiated at 25 % square formation) (7.37 & 8.03%) during 2018 and 2019, respectively. Pink bollworm damage on locule basis was also recorded minimum in T17 (spray of spinosad 45 EC initiated at 25% square formation) with 6.16 and 8.40 per cent damage during 2018 and 2019, respectively. Significant difference was observed between yield of protected and unprotected fields. Yield obtained in protected condition was 1750 and 1628 kg/ha while in unprotected condition it was 2593 and 2356 kg/ha during 2018 and 2019, respectively. Avoidable yield loss was calculated 32.52 and 30.91 percent during 2018 and 2019, respectively.
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    ThesisItemOpen Access
    Biology of polyommatus boetius (L.) on fieldpea and evaluation of various genotype against major insect pests
    (CCSHAU, 2016) Manisha; Roshan Lal
    The present studies entitled “Biology of Polyommatus boeticus (L.) on fieldpea and evaluation of various genotypes against major insect pest” was carried out during rabi 2015-16 at Reseach farm of Pulses Section, Department of Genetics and Plant Breeding and Laboratory of Department of Entomology, CCS HAU, Hisar. For conducting biological studies, rearing was done in laboratory at 28±10C and relative humidity (60-70%). Results revealed that pre-oviposition, oviposition and post-oviposition period ranged from 1 to 2, 2 to 3 and 2 to 3 days, respectively. A single female could lay maximum of 15 eggs and minimum of 13 eggs (average 14 eggs) during her life time. On fieldpea, the longevity of male moths was ranged from 7 to 9 days (average 8 days) and longevity of female moths varied from 9 to 10 days (average 9.5±0.42 days). Incubation period varied from 2 to 3 days (average 2.5±0.7 days). The total larval period ranged from 11 to 13 days (average 12±0.22 days). Average Prepupal period ranged from 2 to 3 days (average 2.22±0.13 days) and pupal period ranged from 6 to 9 days (average 8±0.22 days). Average female to male sex ratio was 1.0 to 1.5. It was found that the mating of adults of P. boeticus occurred in day time only. When the mating was disturbed the pair flew without separation and continued mating. Mating period of P. boeticus varied from 48 to 64 minutes (average 54.3 ±0.07 minutes). Results revealed that the total life cycle varied from 29 to 35 days (average 32.8±4.24 days). Morphometric studies on P. boeticus revealed that the eggs measured 0.47 to 0.57 mm in diameter (average 0.52 mm). Average body lengths of 1st, 2nd, 3rd and 4th instar larvae were 1.17, 2.10, 7.59 and 11.09 mm and average body width of 1st, 2nd, 3rd and 4th instar larvae were 0.16, 0.69, 1.15 and 1.39 mm. Average head capsule length of 1st, 2nd, 3rd and 4th instar larvae were 0.22, 0.70, 1.25 and 1.46 mm. Average head capsule width of 1st, 2nd, 3rd and 4th instar larvae were 0.15, 0.64, 1.10 and 1.34 mm. On an average, pre pupa measured 10.80 mm in length and measured 4.94 mm in width and pupa measured 10.62 mm in length and measured 4.45 mm in width. On an average 1st, 2nd, 3rd, 4th larval instar, pre pupa and pupa male weighted 0.004, 0.021, 0.064, 0.170, 0.155 and 0.088 mg, respectively. Immature stage was not distinguishable in male and female. Adult antennae, fore leg, middle leg and hind leg measured 7.93, 5.78, 6.05, 6.28 mm long in female and 7.02, 5.63, 5.91 and 6.15 mm in male. The average wingspan measured 29.90 mm in male and 33.28 mm in female. Out of the 18 genotypes screened against pod borer complex comprising H. armigera, E. zinckenella and P.boeticus at green pod stage, the infestation ranged from 0.11 to 1.22, 0.00 to 1.44 and 00 to 0.33 larvae/ 3 plants, respectively, whereas at maturity it varied from 0.48 to 7.53, 7.31 to 22.10 and 0.50 to 1.60 per cent, respectively. Genotypes HFP-1137, HFP-530B, and HFP-529 were least susceptible and genotype HFP-8712 was highly susceptible against H. armigera. There was positive and significant correlation of 50 per cent flowering with H. armigera and E. zinckenella. Pod wall thickness had negative and significant correlation with H. armigera and E. zinckenella. Pod length was positive and significantly correlated with P. boeticus pod damage. Trichome density was negative and significantly correlated with E. zinckenella larval population and P. boeticus pod damage. Seasonal incidence studies revealed that C. indicus population had significant negative correlation with temp (min.). H. armigera and P. boeticus population had non- significant correlation with abiotic factors. E. zinckenella larval population had significant positive correlation with Temperature (Tmax.). C. horticola population had significant negative correlation with temp.(max & min) and significant positive correlation with morning relative humidity.