Abstract
The present research was initiated with the objective to evaluate the efficacy of T. chilonis at different release levels in comparison with confidor (immidacloprid) 70WS during the year 2006. The experiment was laid out in RCB design with five treatments including untreated check each replicated four times. Treatments applied consisted of: seed dresser immidacloprid single release 10 trichocards per level (dose), double release 20 cards per level and triple release 30 cards per level and untreated check. Results revealed that both infestation (%) of the borer and egg parasitism is significantly influenced by the releases of T chilonis at different levels as compared to immidacloprid treated plots and check. The triple releases resulted in better parasitism, followed by double releases, whereas immidacloprid was the lowest in parasitism. Minimum infestation (overall %) was recorded in the treatment where 30 trichocard, were used whereas maximum infestation (overall %) was observed in control plots. The highest grain yield was recorded in the triple released plots followed by double released and imidacloprid and single released plots, low yield was recorded in control plots. Triple releases of trichocards resulted in maximum parasitism and lowest infestation of stem borers and hence recommended for better and environmental friendly management of stem borers in maize crop.
Highlights
The triple releases resulted in better parasitism, followed by double releases, whereas immidacloprid was the lowest in parasitism
The highest grain yield was recorded in the triple released plots followed by double released and imidacloprid and single released plots, low yield was recorded in control plots
Analysis of the data indicated that infestation by C. partellus was maximum in control plots (17%), followed by imidacloprid treated plots (10.5 %), where as minimum (5.5 %) infestation was observed in triple release plots
Summary
November and passes the winter as fullgrown larvae in the stubbles [3]. Because of pesticides use, problems have increased, it has stimulated renewed interest in biological control as a control method by itself or as a part of integrated pest control system. Tricocard level/number per unit area significantly affects percent parasitism, maximum parasitism (32.82 %) of C. partellus was observed in plot treated with triple (30 cards/plot) release followed by double (26.20%) and single release (20.62%). Analysis of the data indicated that infestation by C. partellus was maximum in control plots (17%), followed by imidacloprid treated plots (10.5 %), where as minimum (5.5 %) infestation was observed in triple release plots. In this case our results again coincide with [12,13,14], where they worked on effectiveness of T. chilonis against sugarcane borer and achieved similar results, besides; this is more environment friendly and carry no health problem. In contrast to our results [16], reported that T. chilonis being ineffective against the maize stem borer, may be this situation could be due to abnormal environmental conditions where Trichogramma can’t reproduce effectively that could be sufficient for borer eggs parasitism
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