Author(s):

N Murugan, R Krishnan, T Geetha, G Umapathi, P Santhi and R Sivakumar

Abstract: Field experiments were conducted at field No. 68 of Eastern Block, Department of Sericulture, Tamil Nadu Agricultural University, Coimbatore during 2015-2016. Investigations were undertaken on mulberry variety victory-1(V1) to evaluate “Study of irrigation regimes and nutrient management practices on disease incidence of silkworm”. In double hybrid silkworm among the irrigation regimes, 0.9 IW/ CPE ratio of irrigation (I<strong>₂</strong>) has recorded the lowest flacherie and grasserie disease incidence of 3.75 per cent and 1.75 per cent. The different nutrient management practices significantly influenced the disease incidence of double hybrid silkworm. One hundred per cent inorganic fertilizers application (N<strong>₂</strong>) which recorded the lowest flacherie and grasserie disease incidence of 3.25 per cent and 1.25 per cent. The interaction effect of irrigation and nutrient management practices did not significantly influence on the flacherie and grasserie disease incidence in double hybrid silkworm. In cross breed silkworm among the irrigation regimes, 0.9 IW/ CPE ratio of irrigation (I<strong>₂</strong>) has recorded the lowest flacherie and grasserie disease incidence of 4.00 per cent and 1.75 per cent. The different nutrient management practices significantly influenced the flacherie and grasserie disease incidences. One hundred per cent inorganic fertilizers application (N<strong>₂</strong>) has recorded the lowest flacherie disease incidence of 4.00 per cent. Fifty per cent inorganic and 50 per cent organic manures application (N<strong>₃</strong>) has recorded the lowest grasserie disease incidence of 2.00 per cent. The interaction effect of irrigation and nutrient management practices did not significantly influence on the flacherie and grasserie disease incidence.

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