Impact of Varied Sowing Dates on Incidence of Spotted Pod Borer and Gram Pod Borer on Indian bean, Lablab purpureus var. typicus (L.) Sweet in Semi-arid Region of Rajasthan

Author: K. Anvesh*, Shivani Choudhary, K.C. Kumawat, S.K. Khinchi and Akhter Hussain

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Abstract

Indian bean, Lablab purpureus var. typicus (L.) Sweet (family: Fabaceae) is an important vegetable crop in India and other countries. It is presumed that pest appearance, population fluctuation, infestation rate and crop yield are dependent on sowing time. The manipulation of sowing time helps to minimize amount of pest damage by producing asynchrony between pest and host plant. Due to staggered sowing, pests are able to complete 1-2 additional generations in the season. In order to avoid supernumerary generations, sowing dates of crop can be adjusted in such a way that the crop is less palatable to the pest. The experiment was laid out in a simple Randomized Block Design (RBD) with five treatments (date of sowing), each replicated four times. The plot size was 1.8 × 1.8 m2 keeping row to row and plant to plant distance of 45 cm each. The Indian bean, variety Bauni was sown from 11th July, 2019 at weekly interval, i.e., 11th July (early), 18th July (mid early), 25th July (normal), 1s

Keywords

Indian bean, Date of sowing, Spotted pod borer, Gram pod borer, Regression.

Conclusion

— The mean larval population of spotted pod borer, M. vitrata and gram pod borer, H. armigera was minimum in early sown crop (11th July), followed by Mid early (18th July), normal (25th July), late (1st August) and very late sown (8th August) crops. — The pod yield was maximum in early sown crop (58.43 q/ha), followed by mid early (55.60 q/ha), normal (51.24 q/ha), late (46.82 q/ha) and very late sown crop (46.26 q/ha). The difference in population and pod yield was found to be significantly low between two consecutive dates but there was a significant variation in yield and pest population between early and very late sown crops. Hence in the semi-arid region of Rajasthan sowing of Indian bean crop in second or third week of July is appropriate to minimize damage by pod borers and to get higher yields. — There was a positive correlation between sowing dates and larval population. Pod yield had negative correlation with sowing dates and larval population.

References

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How to cite this article

K. Anvesh, Shivani Choudhary, K.C. Kumawat, S.K. Khinchi and Akhter Hussain (2022). Impact of Varied Sowing Dates on Incidence of Spotted Pod Borer and Gram Pod Borer on Indian bean, Lablab purpureus var. typicus (L.) Sweet in Semi-arid Region of Rajastha