Effect of soil pH on fecundity, egg hatching and larval survival of phytophagous scarabs of Himachal Pradesh
Keywords:Soil pH, whitegrubs, Brahmina coriacea, Holotrichia longipennis, Anomala dimidiata
AbstractThe possible effects of soil pH on fecundity, egg hatching and larval survival of Brahmina coriacea, Holotrichia longipennisÂ and Anomala dimidiata were investigated in laboratory. Soils were amended with lime or aluminium sulphate to produce aÂ 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,Â significantly higher (55.3 eggs/female) fecundity was recorded at pH 6.5. The soil pH did not infl uence the incubation periodÂ in any of the whitegrub species in the present study, however, egg survival was signifi cantly affected in B. coriacea and A.Â dimidiata in different soil pH levels. In case of B. coriacea and A. dimidiata, higher egg survival (75.4% and 84.1%) wasÂ 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 cantlyÂ affected in some species in some instars. In fi rst instar, signifi cant differences in larval survival were observed in B. coriaceaÂ and A. dimidiata. Maximum survival in both the species was recorded at pH 6.5. Almost similar trend was noticed inÂ third instar grubs. Contrary to fi rst and third instar, larval survival during second instar was signifi cantly affected inÂ H. longipennis, and maximum survival (77.5 %) was recorded at pH 4.5.
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