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003			OSt
005			20220831144417.0
008			140128s9999 xx 000 0 und d
082			_a632.6 _bRAI/MA
100			_aRaihana K C
245			_aManagement Of Banana Pseudostem Weevil Olivier With Induced Resistance and Epideictic Compounds
260			_aVellanikkara _bDepartment of Entomology, College of Horticulture _c2002
502			_bMSc
520	3		_aThe present investigation on management of banana pesudostem weevil Odoiporus longicollis Olivier (Coleoptera:Curculionidae) with induced resistance and epideictic compounds was undertaken in the Department of Entomology, College of Horticulture, Vellanikkara during 2000-2001. Extraction of epideictic pheromone associated with the weevil, evaluation of the resistance of the moisture stressed Nendran plants to the attack of the weevil and the resistance offered by the progenies of tissue cultured plants of infested plants were considered for the study . Females of 0. longicollis at different population intensities were released on cut pseudo stem of Nendran in the laboratory to arrive at the minimum pest load at which the concentration of epideictic pheromones would deter further oviposition. The results indicated that the weevil numbers above five per pseudostem was deterrent to conspecific emales. Pest load which would deter oviposition on banana was also be assessed by artificial confined release of females in the field. With increase in the pest loads on the plants there was a deterrency effect in the oviposition by the weevils. The maximum oviposition was observed by two weevils per plant (4.25). Even with twenty females per plant the oviposition count was very less (1.75). The oviposition deterrency was due to the deposition of the epideictic pheromone by the conspecific females after egg laying. It was seen that the acetone and ether extracts of pseudo stem pieces of 10 cm where five pairs of weevils had laid their eggs, when sprayed after air drying and dilution with water deterred the oviposition by other females. The acetone extract, air dried and diluted with water was the most effective for the extraction of the pheromone. Identification of the chemical composition of pheromones will help in their utilisation against the weevil. No-choice tests were designed to study the resistance of moisture stressed plants to the weevil attack. The weevil infestation was absent in those plants which received the minimum quantity of water though their yield was low. However, the plants which received slight reduction in the moisture (0.9 IW/CPE) •. gave a yield similar to those plants grown with normal irrigation. Only 40 per cent of these plants was infested when comparing with 90 per cent infestation in control plants. Rind-pulp ratio was also in par with control plants. The results indicated that the plants which receive a slight moisture stress from 6th month onwards at least in the outer sheaths will escape :from the attack of the weevil without affecting the yield adversely. No-choice experiment was conducted on the progemes of infested tissue cultured plants to evaluate the resistance to the weevil attack. The tissue cultured plants was found very resistant to the weevil attack. The experiment was started from the flower bud initiation stage (February). No plant was infested .upto three months after artificial infestation. Infestation was noticed during rainy period. The grades of infestation (0\ and O2) were very low in all the experimental plants.
700			_aRanjith A M (Guide)
856			_uhttp://krishikosh.egranth.ac.in/handle/1/5810106131
942			_2ddc _cTH