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Kumar, Vijay
- Influence of Weather Factors and Spray Patterns on Wheat Aphids and their Coccinellid Predator
Abstract Views :253 |
PDF Views:130
Authors
Affiliations
1 Department of Zoology, Guru Nanak Dev University, Amritsar 143005, Punjab, IN
2 Department of Entomology, Punjab Agricultural University, Ludhiana 141004, Punjab, IN
1 Department of Zoology, Guru Nanak Dev University, Amritsar 143005, Punjab, IN
2 Department of Entomology, Punjab Agricultural University, Ludhiana 141004, Punjab, IN
Source
Journal of Biological Control, Vol 23, No 4 (2009), Pagination: 375-379Abstract
Wheat is a premier winter cereal crop in India. Among the various insect pests, aphids appear as a complex of species including Sitobion avenae (F.), S. miscanthi (Takahashi), Rhopalosiphum maidis (Fitch) and R. padi (L.). Coccinella septempunctata L. is a dominant predator of aphids. Various spray patterns were tested to check their effectiveness against aphids. All the treatments more effectively controlled the aphids compared to control. However, the insecticides adversely affected the predator population. The predator populations was reduced by 87.5, 85.4 and 78.9%, respectively, one day after spray in completely sprayed, sprayed strip and unsprayed strip plots, whereas the reduction was only 22.8% in peripherally sprayed plot. The predator recovery started after 3 days in all the treated plots but it was very slow in the completely sprayed plot. Among all the treatments, the peripherally treated plot conserved maximum predator population and controlled the multiplication of the pest.Keywords
Wheat Aphids, Coccinellid, Coccinella septempunctata, Spray Pattern, Recovery, Weather Factors.Full Text
References
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- Effectiveness of Trichogramma Chilonis Ishii in the Suppression of Chilo partellus (Swinhoe) in Summer Maize
Abstract Views :239 |
PDF Views:119
Authors
Vijay Kumar
1,
Uma Kanta
1
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 25, No 2 (2011), Pagination: 92-97Abstract
Studies on the effectiveness of Trichogramma chilonis Ishii in the suppression of Chilo partellus in summer maize were carried out at Punjab Agricultural University, Ludhiana during summer 2006 and 2007. The mean total incidence of maize stem borer was minimum in maize plot with single release of T. chilonis @ 100,000/ha on 12-day-old crop (14.3%) followed by 15-day-old crop (153%) and incidence in these two was significantly lower as compared to untreated check (33.0%) and proved effective in reducing the incidence of maize stem borer and subsequently increased the maize yield. However, the pest incidence in all biocontrol treatments was higher than the maize plot treated with deltamethrin 2.8 EC @ 200 ml ha-1 (10.5%). The yield obtained from maize plot with single release of T. chilonis @ 100,000/ha on 12-day-old and 15-day-old crops (25.9 and 25.4 q ha-1 , respectively) was significantly higher than all other treatments except maize plot treated with deltamethrin 2.8 EC @ 200 ml ha-1 (26.2 q ha-1 ). The parasitism rate of C. partellus eggs on maize plants was significantly higher in releases of T. chilonis @ 100,000 ha-1 on 12- and 15-day-old crop (44.8 and 43.1%, respectively) as compared to untreated check (4.4%) and plots treated with deltamethrin 2.8 EC @ 200 ml ha-1 (1.0%).Keywords
Chilo partellus, Incidence, Trichogramma chilonis, Recovery, Yield, Maize.Full Text