IMPACT OF WHITE GRUBS [HOLOTRICHIA LONGIPENNIS (BLANCHARD)] ON MOST PRIMITIVE JHUM CULTIVATED RICE ECOSYSTEM IN NORTH EAST INDIA

IMPACT OF WHITE GRUBS [HOLOTRICHIA LONGIPENNIS (BLANCHARD)] ON MOST PRIMITIVE JHUM CULTIVATED RICE ECOSYSTEM IN NORTH EAST INDIA

Samik Chowdhury1*, Pritin P. Sontakke1, Shantanu Das2, Tapas Paul3, Jayashree Bhattacharjee4 and Debashre Bhattacharjee5
1*ICAR Research Complex for NEH Region, Mizoram Centre, Kolasib, Mizoram-796081, India.
1College of Agriculture, Kerala Agricultural University, Vellayani, Thiruvanathapuram, Kerala 695 522, India
2Department of Plant Breeding and Genetics, Assam Agricultural University, Jorhat-785 013, Assam, India
3,5ICAR RC for NEH Region, Tripura Centre, Lambucherra-799210 India
4Department of Plant Pathology, Bidhan Chandra Krishi Vidyalaya (BCKV), Mohanpur, Nadiaya Distrcit-741252
[Corresponding author E-mail1*: samikchowdhury33@gmail.com]
Received: 06-08-2015 Accepted: 15-09-2015
Abstract:
Northeast accounts for the largest area under shifting cultivation in India. Shifting cultivation is locally known as the Jhum cultivation. In jhum rice ecosystem, White grub is emerging problematic and devastating pest. More or less it has affected different crops by cutting larvae appropriately called grubs feed on the roots and rootlets of the plants thereby affecting the water and nutrient flow to the aerial parts of the plant. As a result of which the plant slowly dries and eventually dies leading to huge economic losses in commercial crops. Around 70% damaged cased by this insect to rice followed by fruit crops 26% and pulses 19% in jhum ecosystem of different states of North-East region. ITKs, plough field, seed treatment, soil application, foliar application of chemical insecticides, entomopathogens and entomophillic nematodes (EPNs) widely followed to lessen the white grub menace becomes futile at times in severe cases. Phorate has one of the most important soil insecticides which have given better cure in severe infestation in jhum areas in North-East region.

Keywords: White grub, Jhum cultivation, rice, EPNs, Phorate, insecticides

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