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Virk, J. S.
- Biology of Australian Ladybird Beetle, Cryptolaemus montrouzieri Mulsant on Phenacoccus solenopsis Tinsley
Abstract Views :268 |
PDF Views:117
Authors
Affiliations
1 Department of Entomology, College of Agriculture, Punjab Agricultural University, Ludhiana 141004, Punjab, IN
1 Department of Entomology, College of Agriculture, Punjab Agricultural University, Ludhiana 141004, Punjab, IN
Source
Journal of Biological Control, Vol 24, No 2 (2010), Pagination: 123-125Abstract
The biological parameters of Cryptolaemus montrouzieri on Phenacoccus solenopsis were studied under laboratory conditions at 17-27°C and 58-82% RH. The mean incubation period and total larval periods were 4.36 and 17.33 days (2.78, 4.64, 6.13 and 3.79 days for 1st, 2nd, 3rd and 4th instar grubs, respectively). The pre-pupal, pupal and total development period recorded were 2.38, 8.69 and 32.75 days, respectively. Pre-oviposition, oviposition and post-oviposition periods were 7.23, 46.75 and 7.80 days, respectively. Males lived longer than females (68.30 and 61.78 days, respectively) and life cycle duration were 100.29 and 93.77 days, respectively. The mean fecundity was 98.15 (eggs/female) and sex ratio (male:female) was 1:1.36. The per cent hatchability and adult emergence observed were 79.00 and 88.50, respectively.Keywords
Biological Parameters, Cryptolaemus montrouzieri, Phenacoccus solenopsis.- Evaluation of Release Technology for Trichogralnma chilonis Ishii in the Management of Cotton Bollworms
Abstract Views :203 |
PDF Views:115
Authors
Affiliations
1 Department of Entomology, Punjab Agricultural University Ludhiana, 141 004, Punjab, IN
1 Department of Entomology, Punjab Agricultural University Ludhiana, 141 004, Punjab, IN
Source
Journal of Biological Control, Vol 20, No 2 (2006), Pagination: 123-126Abstract
Studies were carried out during 2003 and 2004 to find out the release technology of Trichogramma chilonis Ishii (weekly releases from July to October @ 1, 50, 000 ha) for the management of cotton bollworms. Releases as tricho-card (100, 150 and 200 points/ ha) were compared with adult releases. On the basis of incidencc of bollworms among fruiting bodies (17.63 and 16.79%), green bolls (26.87 and 14.14%), parasitization of Helicoverpa armigera (Hubner) eggs (17.41 and 19.64%) and seed cotton yield (8.24 and 9.26 q/ha). The releases as adult proved better. Releases at 200 points/ ha was better than releases at 100 and 150 points/ha.Keywords
Bollworms, Cotton, Release Technology, Trichogramma chillonis.- Role of Trap Crops in Increasing Parasitisation Efficiency of Trichogramma chilonis Ishii in Cotton
Abstract Views :253 |
PDF Views:172
Authors
Affiliations
1 Punjab Agricultural University, Department of Entomology, Ludhiana 141004, Punjab, IN
1 Punjab Agricultural University, Department of Entomology, Ludhiana 141004, Punjab, IN
Source
Journal of Biological Control, Vol 18, No 1 (2004), Pagination: 61-64Abstract
The role of trap crops on the parasitisation efficiency of TricllOgramma chilonis was studied at farmer's field at village Khuban (Distt. Ferozepur). Maize, sorghum, pearl millet and marigold were tested as trap crops. One row of trap crop was grown after every 20 rows of cotton crop along with pure crop of cotton. The egg parasitoid was released 13 times during July to September at weekly interval @ 1, 50,000 per hectare. Need based applications of comparatively safe insecticides were also made. The highest mean parasitization (10.48%) was observed when sorghum was used as trap crop and it was significantly higher than all other treatment. The parasitisation when marigold was used as trap crop was also higher (8.08 %) than pure cotton. The mean incidence among green bolls was lowest (2.74 %) when sorghum was used as trap crop and it was significantly lower than other treatments except when marigold (3.52 %) and pearl-millet (3.8 %). The seed cotton yield in pure cotton was lowest (13 q/ha) which was on par with maize (13.1 q/ha) but these were significantly lower than other treatments. The yield was significantly highest (14.8 ql ha) when sorghum was used as trap crop.Keywords
Bollworms Complex, Cotton, Parasitization, Trap Crop, Trichogramma chilollis.- Effect of Varieties/ Hybrids of Cotton on the Parasitization Efficiency of Trichogramma chilonis Ishii
Abstract Views :216 |
PDF Views:104
Authors
Affiliations
1 Department of Entomology, Punjab Agricultural University, Ludhiana 141004, Punjab, IN
1 Department of Entomology, Punjab Agricultural University, Ludhiana 141004, Punjab, IN