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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP
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    Abstract - Issue May 2016, 37 (3)                                     Back


nstantaneous and historical temperature effects on a-pinene

Effect of nitrogenous fertilizer on yellow mite infestation in Corchorus spp.

 

B.S. Gotyal*, R.K. De, K. Selvaraj, S. Satpathy, Mukesh Kumar and P.N. Meena

Crop Protection Division, ICAR-Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore-700 120, India

*Corresponding Author E-mail: gotyalento@gmail.com

 

 

Publication Data

Paper received:

24 March 2015

 

Revised received:

18 September 2015

 

Accepted:

01 December 2015

 

Abstract

The pest status of yellow mite, Polyphagotarsonemus latus (Banks) has enhanced jute causing regular infestation. Improper crop management, particulary imbalanced fertilizer application encourages population build-up and outbreak of mite and other sucking pests.Field experiments were conducted to study the effect of different levels of nitrogenous fertilizer (40, 60, 80, 100 and 120 kg ha-1) on infestation of P. latus in jute (cv. JRO-8432) in two subsequent cropping seasons. Results revealed there was significant variation on infestation of P. latus in jute crop treated with different levels of nitrogenous fertilizers. Moderate infestation (96.73 mites cm-2 leaf) of yellow mite during peak period at 55 days after sowing (DAS) was recorded in the recommended dose (80:40:40 kg ha-1) as compared to higher doses i.e., 120: 40: 40 kg ha-1 (138.52 mites cm-2 leaf). Although, positive correlation exists between N-fertilization and mite population, yield was maximum with highest N dose i.e., 120: 40: 40 and incremental dose of nitrogen on yield was clearly manifested on the benefit cost ratio (BCR) of different NPK dosages, which was highest (1.58) at 120: 40:40 level. It is evident from the study that although NPK had favorable effect on population establishment and it may also replenish the damage as fibre yield was maintained at higher doses instead of higher mite population. These study clearly suggested that slight manipulation in recommended doses of N fertilizer can contribute substantially in regulating the abundance of yellow mite with non-significant effect on yield enhancement in jute.? ??

    

 

 

 Key words

Corchorus spp., Fibre yield, Jute, Nitrogen doses, Polyphagotarsonemus latus

 

 

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