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Studies on Succession and Population Dynamics of various Insect Pests in Established Sorghum Varieties

Author: Shikha Patil and Bhavna Varma

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Abstract

The present investigation entitled, “studies on succession and population dynamics of various insect pests in established sorghum varieties” was carried out in the experimental field of All India coordinated Sorghum Improvement Project, College of Agriculture, Indore, RVSKVV, Gwalior, M.P. during Kharif season established varieties (CSH-18, SPH-1653, Vidisha 60-1, JJ1041, JJ938, JJ1022 and RVJ1862) were sown in non-replicated manner. No insecticides were applied on the crop. Shoot fly (Atherigona soccata), stem borer (Chilo partellus), ear head bug (Calocoris angustatus), ear head worms (Cryptoblabus sp.) were recorded to be infesting the sorghum crop. The peak activity of shoot fly was recorded in SPH 1653 at 25 July (30th SMW) and the peak activity of stem borer was recorded in JJ 938 at 26 July (30th SMW) and the pick activity of ear head bug was recorded in JJ 1022 at 24 Sep (39th SMW) and the pick activity of ear head worm was recorded in JJ 938 at 24 Sep. (39th SMW).

Keywords

Sorghum, Shoot fly, Stem borer, Ear head bug, Ear head warm and Population dynamics

Conclusion

On the basis of overall performance in combating pests the following entries have been categories as resistant varieties, moderately resistant varieties and susceptible varieties. Under timely sown crop condition bug and worm count ranged between 3.33 and 12.60, 3.03 and 15.33 respectively. However, under late sown condition the population of bug and worm ranged from 1.67 to 6.67 and 2.33 to 7.67. It can be concluded from present data that maximum infestation of shoot fly dead hearts observed in cultivars SPH 1653 as compared to rest of cultivars. However, the more infestation by stem borer (leaf injury and dead hearts) was reported in JJ 938. The maximum ear head bug individuals were found in JJ 1022 whereas the population of ear worm more in JJ938.

References

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How to cite this article

Shikha Patil and Bhavna Varma (2023). Studies on Succession and Population Dynamics of Various Insect Pests in Established Sorghum Varieties. Biological Forum – An International Journal, 15(10): 1419-1422.