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Annals of Plant Protection Sciences
Year : 2011, Volume : 19, Issue : 1
First page : ( 71) Last page : ( 74)
Print ISSN : 0971-3573. Online ISSN : 0974-0163.

Varietal screening and role of morphological factors on distribution and abundance of spotted pod borer, Maruca vitrata (Geyer) on Cowpea

Halder Jaydeep, Srinivasan S.

Department of Entomology, Sri Venkateswara Agril. College (A.N.G.R.A.U.), Tirupati-517 502, India <jaydeep_iari@rediffmail.com>

Received:  12  January,  2011; Accepted:  25  February,  2011.

Abstract

Eight plant parameters, viz., pod wall thickness, number of pods / cluster, angle between the pods, trichomes on leaves and stems, trichome length, pod length and pod width were studied in relation to the expression of varietal reaction towards, Maruca vitrata in eleven varieties of cowpea. It was observed that highly susceptible cv. GC-9708 had least number of trichomes on stems (5.1) and leaves (4.8) as compared to highly tolerant cv. HC-270 which had 7.5 and 9.4 trichomes / mm2, respectively. Pod wall thickness, angle between the pods and pod width showed a negative correlation with pod damage. Highly susceptible cv. GC-9708 possessed lowest pod wall thickness (0.77 mm), least pod width (6.35 mm) and minimum pod angle (40o) as compared to most tolerant cv. HC-270 (0,89 mm, 7.80 mm & 85o, respectively). Similarly, highest pod length (15.55 cm) and maximum number of pods / cluster (2.8) were recorded from GC-9708 as compared to others. Free choice arena test also confirmed that highest larval orientation was observed in GC-9708 (susceptible) both in pods (18%) and flowers (13%) than the tolerant cv. (HC-270).

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Key words

Biophysical parameters, Maruca vitrata, Pod damage, Trichome..

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