Off-season survival of the sapodilla seed borer, Trymalitis margarias in India- a clue for an effective cultural management strategy

Authors

  • P D Kamala Jayanthi
  • Abraham Verghese

Keywords:

Sapodilla, Manilkara achras, seed borer, Trymalitis margarias, off-season, monitoring, cultural management

Abstract

Sapodilla seed borer, Trymalitis margarias, is causing huge losses to farmers in India. The concealed nature of larvae within the seeds renders the management of this pest a challenge. The sparse and continuous fl owering habit of sapodilla (Manilkara achras) plants after main cropping period makes the survival of this monophagous pest easier during off-season. A continuous monitoring during off-season showed that the stray sapodilla fruits were serving as a potential source of infestation for tortricid seed borer, T. margarias. Correlation analysis between the off-season and main cropping season T. margarias incidence exhibited a signifi cant (P < 0.01) positive correlation (r = 0.85**) with the mean infestation of 19.40% and 23.16%, respectively. Further, a pooled (data over fi ve years) linear regression model showed that variability in the seed borer infestation during main-season can be explained to the tune of 71% through stray fruits alone. Multiple infestations (1-4 exit holes/fruit) were found to be common during off season compared to regular season (1-2 exit holes/fruit). Removal of stray fruits during off-season reduced the seed borer incidence in the subsequent main crop.

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Published

2017-12-31

How to Cite

Jayanthi, P. D. K., & Verghese, A. (2017). Off-season survival of the sapodilla seed borer, Trymalitis margarias in India- a clue for an effective cultural management strategy. Indian Journal of Plant Protection, 45(4). Retrieved from https://epubs.icar.org.in/index.php/IJPP/article/view/105022

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Articles