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Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP) >
BVAAP Vol.18 [2010] >
BVAAP Vol.18(1) [June 2010] >
| Title: | Bio-efficacy of different entomopathogenic nematode species against Scarab Grubs |
| Authors: | Rathour, K S
Kumar, Sushil
Ganguli, Sudershan |
| Issue Date: | Jun-2010 |
| Publisher: | CSIR |
| Abstract: | Entomopathogenic Nematodes
(EPNs) of the families Steinernematidae and Heterorhabditidae are being used as
potential biological control
agents against several insect-pests of turf grass, citrus, vegetables, fruits
and other agriculturally
important crops, as well as
many veterinary and house-hold insect pests including termites. They carry
symbiotic bacteria Xenorhabdus spp. (Steinernematidae) and Photorhabdus spp.(Heterorhabditidae) which
is required
to kill the insect host and to
digest its tissues, thereby providing nutrient conditions for nematode growth
and
development. These nematodes
kill the host insect within 24-48 h. by causing septicemia, complete their life
cycle
inside the cadavers and emerge
en-masses within 4-5 days after
mortality in case of steinernematidae and 9-15 days
in case of helerorhabditids.
Scarabs (Order Coleoptera) are serious pests of several field crops. Their
adults feed on
foliage while their larval
forms, commonly called as white grubs, live in soil and feed on roots. Our
recent surveys
showed heavy population of
grubs in the rhizosphere of sugarcane in Meerut. The grubs were collected from
the
fields for use in the present
study. Managing scarab grubs by entomopathogenic nematodes is highly
challenging
because they tend to avoid
infection by frequent defecation. The biocontrol efficacy of 8 EPN species/strains
viz. Steinernema thermophilum; S. glaseri; S. riobrave strain GAU-M; S. carpocapsae strain Megha-1; Heterorhabditidae
bacteriophora strain GAU; indica strain
Megha-3; Heterorhabditiditis strain Haryana-2 and Haryana-5 was tested
against scarab (Hototrichia cosanguina) larvae. All the
species/strain were found to be highly efficacious against
scarab larvae and could induce
80-100% mortality with in 5-6 DAI (days after inoculation). Among the tested
species/strain S. glaseri was found to be highly efficacious
inducing 100% mortality within 5 DAI; followed by S.
thermophilum, and H. indica causing 100% mortality within
6 DAI. The other tested species/strain S. riobrave, S.
carpocapsae, Heterorhabditis strain Haryana-2. H. bacteriophora and Heterorhabditis strain Haryana-4 could induce
only 80% mortality up to 6
DAI. The higher efficacty of S. glaseri is attributed to its cruising type behavior best
suited for accessing scarab
larvae. In view of the pesticide resistance being developed in several insects,
EPNs can
be a suitable eco-friendly option for incorporating in integrated pest
management programmes. |
| Page(s): | 9-14 |
| ISSN: | 0975-2412 (Online); 0771-7706 (Print) |
| Source: | BVAAP Vol.18(1) [June 2010]
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