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Subject: Sericulture × End date: 2003 × Start date: 2003 × Type: Thesis × Thesis Type: M.Sc ×
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    ThesisItemOpen Access
    IMPACT OF LEGUME INTERCROPPING IN PAIRED ROW OF MULBERRY ON SILKWORM
    (University of Agricultural Science, Dharwad, 2003) Hadimani, Durgappa K; Patil, G M
    "A field experiment was conducted at Main Research Station, Dhanvad from June to November, 2001 under irrigated conditions to study the impact of legume intercropping in paired row [(60+120 cm)x30 cm] of S41 mulberry and its effect on silkworm {Bombyx mori L.). There were seven treatment combinations with three legumes in two row proportions laidout in a randomized complete block design with three replications. A laboratory experiment was also conducted during rainy season (from 18""* August to 21st September, 2001), to study the silkworm growth and cocoon yield. At 60 days after pruning sole mulberry recorded significant increase in plant height (159.00 cm), number of branches (13.33/plant), number of leaves (121.41/plant), leaf area index (13.83) and leaf yield (295.48 g/plant and 10.93 t/ha/crop). Among the intercropping treatments, mulbeny'+soybean two rows (9.73 t/ha/crop) recorded significantly higher mulberr}' leaf 3'ield. Among the intercropped legumes, soybean three rows recorded significantly higher pod number (90.53/plant), hundred seed weight (11.44 g) and seed yield (1200 kg/ha). Performance of silkworm (NB4D2) showed non-significant difference with respect to larval characters. Silk productivity (4.81) and silk gland weight (1.57 g) were significantly higher in mulberry+soybean (three rows). 85.66 per cent ERR was recorded in mulberry+soybean (two rows). Cocoon yield and grainage parameters (except fecundity) were nonsignificant. Whereas, cocoon characters differed significantly. However, higher shell percentage (18.94) in mulberry+soybean (two rows), least denier (2.15) in mulberry+greengram (two rows) and mulberry+blackgram (two rows) and higher renditta (9.54) in mulberry+greengram (three rows) was recorded. The incidence of flacherie, grasserie and muscardine (all the instar worms) in intercropping treatments was less compared to sole mulberr} The overall average evaluation index value for all traits viz., silk gland weight, silk productivity, ERR, fecundity, shell ratio and renditta was higher in mulberry+three rows of soybean (50.12) while i t ^ a s least in sole mulberry (49.85). Mulberr>-+greengram three rows recordedsignificantly higher net returns (Rs.50,129/ha/crop) and B:C ratio (4.28)."
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    ThesisItemOpen Access
    EFFECT OF WET SHOOT FEEDING AND FREQUENCIES ON THE ECONOMIC TRAITS OF MULBERRY SILKWORM, Bombyx mori L.
    (University of Agricultural Science, Dharwad, 2003) Gangarathnamma, B S; Rayar, S G
    "The effect of wet shoot feeding and frequencies on the economic traits of silkworm, B om b y x m o r i L. was studied. The experiment was carried out during winter and summer season by using cross breed, Pure Mysore x NB^D^ silkworm and M-5, mulberry leaves. The chawki silkworms were fed with wetshootlet daily once, twice and thrice. While, late age silkworms were fed with wet cut shoot daily twice, thrice and four times and compared with standard feeding practices. The results revealed the superiority of wetshootlet and cut shoot feeding to chawki and late age silkworm by significantly improving all the economic traits studied over the standard feeding practices. The overall performance of both the rearing revealed the superiority of two times wetshootlet feeding at chawki + three times wet cut shoot feeding / day at late age and resutled in shorter chawki (251.96 h), fifth instar (166.50 h) and total larval (611.83 h) duration, highest chawki (1.527 g), mature larval (46.30 g) and pupal weight (18.72 g) and ERR (83.66%). Similarly, the treatment also recorded significantly highest cocoon yield / 10,000 worms (22.14 kg), cocoons per 1000 larvae (837), cocoon weight (23.07/10 cocoons), cocoon shell weight (4.317 g/10 shells), cocoon shell ratio (18.33%), silk productivity (6.253 cg/day), filament length (959.66 m), denier (2.58), renditta (7.23) and least defective cocoons (12.93%), grasserie (10.55%) and flacherie (10.91%) disease. While, the standard feeding practice of three normal shootlet feeding at chawki + three times normal cut shoot feeding / day at late age recorded significantly lesser values for all the above traits. Hence, it is concluded that, two times wet shootlet feeding at chawki + three times wet cut shoot feeding/day at late age, could be adopted in commercial rearing after large scale multilocation evaluation in the field."