0 Views
K. SUNIL KUMAR*, T. MURALI KRISHNA, K. SREEDEVI, K. MANJULA, R. SARADA JAYALAKSHMI DEVI, B. RAVINDRA REDDY AND K. DEVAKI
ARS, Utukur, ANGRAU, Kadapa Dist., A.P.
Holotrichia reynaudi Blanchard is one of the predominant species of root grub in groundnut ecosystem of Rayalaseema region, Andhra Pradesh. Two field experiments were conducted at the research farm of Agricultural Research Station, Utukur, Kadapa during kharif, 2014 and 2015 to estimate the damage caused by root grub, H. reynadui in groundnut under three different dates of sowing. The studies revealed that, in June IInd FN sown crop, the average per cent plant mortality per m2, number of grubs per m2 in unprotected and protected plots were 23.36 per cent, 2.23 grubs m-2 and 6.20 per cent, 0.39 grubs m-2 respectively. In July Ist FN sown crop, they were 21.20 per cent, 2.08 grubs m-2 and 5.41 per cent, 0.37 grubs m-2 and in July IInd FN sown crop they were 20.46 per cent, 1.95 grubs m-2 and 5.14 per cent, 0.34 grubs m-2 respectively. The pod yield in June IInd FN sown unprotected and protected plot were 1063.50 kg ha-1 and 1680.50 kg ha-1, in July Ist FN sown it was 1148.50 kg ha-1 and 1745 kg ha-1 and in July IInd FN sown it was 1175 kg ha-1 and 1771kg ha-1. In June IInd FN sown crop the per cent loss in yield was higher (36.74%) followed by July Ist FN sown plot (34.19%) and July IInd FN sown plot (33.65%).
Holotrichia reynaudi, plant mortality, assessment of loss, damage, groundnut.