Effect of soil pH on fecundity, egg hatching and larval survival of phytophagous scarabs of Himachal Pradesh

Authors

  • Swaroop Kumar
  • R S Chandel

Keywords:

Soil pH, whitegrubs, Brahmina coriacea, Holotrichia longipennis, Anomala dimidiata

Abstract

The possible effects of soil pH on fecundity, egg hatching and larval survival of Brahmina coriacea, Holotrichia longipennis and Anomala dimidiata were investigated in laboratory. Soils were amended with lime or aluminium sulphate to produce a range of pH from 4.5-7.5. Fecundity was not infl uenced by soil pH in B. coriacea and A. dimidiata, but in H. longipennis, significantly higher (55.3 eggs/female) fecundity was recorded at pH 6.5. The soil pH did not infl uence the incubation period in any of the whitegrub species in the present study, however, egg survival was signifi cantly affected in B. coriacea and A. dimidiata in different soil pH levels. In case of B. coriacea and A. dimidiata, higher egg survival (75.4% and 84.1%) was recorded at soil pH of 7.5. Duration of instars (I - III) was not infl uenced by the soil pH, but larval survival was signifi cantly affected in some species in some instars. In fi rst instar, signifi cant differences in larval survival were observed in B. coriacea and A. dimidiata. Maximum survival in both the species was recorded at pH 6.5. Almost similar trend was noticed in third instar grubs. Contrary to fi rst and third instar, larval survival during second instar was signifi cantly affected in H. longipennis, and maximum survival (77.5 %) was recorded at pH 4.5.

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Published

2020-09-21

How to Cite

Kumar, S., & Chandel, R. S. (2020). Effect of soil pH on fecundity, egg hatching and larval survival of phytophagous scarabs of Himachal Pradesh. Indian Journal of Plant Protection, 45(4). Retrieved from https://epubs.icar.org.in/index.php/IJPP/article/view/105003

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Articles