Host — parasite interaction between two species of white grubs infesting sugarcane and two species of entomopathogenic nematodes
2000
Karunakar, G. | Easwaramoorthy, S. | Daṿid, Ḥ.
Among the two entomopathogenic nematodes,Steinernema glaseri Steiner andHeterorhabdities indicus (Poinar, Karunakar, David) tested on different instars of white grubs,Holotrichia serrata f. andLeucopholis lepidophora Brum. In laboratory conditions, the later one took less time (3.80 days) to inflict mortality ofH. Serrata than fomer (4.37 days), while it showed a reverse trend inL. lepidophora. The mean time taken to cause host mortality of white grubs increased as the instar stages increased. Infective juveniles (KJs) of both the nematode species emerged earlier (12.08 days) from first instar grubs than in second and third instar grubs. IJs of H. indicus emerged for a prolonged period (24.22 days) thanS. glaseri (21.90 days) on different instars of white grubs. IJs of both the species emerged for significantly longer period (24.17 days) inL. lepidoptera than inH. serrata (21.95 days). The emergence of IJs of these nematodes was significantly more in third instar grubs (40.68 days) than in first and second instars (13.25 days).H. indicus multiplied higher in number per unit body weight of white grub (864.74 IJs) thanS. glaseri (262.07 IJs). The multiplication of these nematodes per unit body weight of white grubs was more in third instar compared to first and second instar grubs.
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