STANDARDIZATION OF MASS REARING TECHNIQUE AND FIELD EVALUATION OF PHEROMONE OF SHOOT AND FRUIT BORER, Conogethes spp. (LEPIDOPTERA: CRAMBIDAE) ON SELECTED HOST PLANTS
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Date
2018-12-15
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UNIVERSITY OF AGRICULTURAL SCIENCES, GKVK BENGALURU
Abstract
Studies conducted on standardization of mass rearing technique and field
evaluation of pheromone of shoot and capsule borer, Conogethes spp. (Lepidoptera:
Crambidae) on selected host plants brought out striking differences in the pest species.
The studies on artificial diet clearly showed that the diets incorporated with castor and
cardamom powders were suitable for growth and development of C. punctiferalis and C.
sahyadriensis, respectively. Further studies on standardization of other ingredients in the
diet like Casein 35g/ml, Vit-E capsule (1g/ml), Sorbic acid (1g/ml), Methyl parahydroxy
benzoate (2g/ml) and Streptomycin sulphate (0.5g/ml) recorded higher percentage of
fecundity, survivability and pupal weight of C. punctiferalis and C. sahyadriensis. Field
observations on seasonal incidence of C. punctiferalis in castor fields revealed that
maximum infestation occurred during November to December. The incidence of C.
sahyadriensis in cardamom plantations was maximum cardamom shoot during May and
in capsule during October to November which coincided with tillering and capsule
formation. Similarly, in ginger plantations results revealed that maximum borer
infestation occurred during September to October. The influence of abiotic factors
showed that temperature and relative humidity played a major role in the incidence of
these borers in cardamom, castor and ginger. Studies on standardization of trapping
technique indicated that all the traps baited with pheromone lures had significantly higher
catches over the traps without pheromone lures. Among four types of traps (delta, water,
funnel and cross-vane trap) tested, delta trap with lure (contained (E)-10-hexadecenal
(E10-16: Ald), (Z)-10-hexadecenal (Z10-16: Ald) and hexadecenal (16: Ald) at 100:8:16)
proved the most effective for trapping males of C. punctiferalis moths compared to other
traps. Further studies on colour and height of traps revealed that yellow delta traps
installed at the crop canopy level trapped maximum moths of C. punctiferalis