Abstract
This study tsted egg parasitoid Trichogramma chilonis and the predator chrysoperla carnea in present of seven selective insecticides. The study was carried out at the field experiments of ministry of Science and Technology /Agric and Biol. Res. Center 2003 – 2005 and aimed to check the efficacy of the biological control agents as well as the selective insecticides for controlling or reducing the population density of the major pest on cotton Helicoverpa armigera. The results showed that the population counts of H. armigera and C.carnea in 25 plant and parasitization percent by T. chilonis prior to the first spray were ranged from, 0.66 to 3.67, 3.33 to 7.66 and 24.30 to 40.00 for H. armigera, C. carnea and parasitization rate by T. chilonis in present of all the selective insecticides, respectively. The results also indicated that the number of the pest and Biological control agents after the first spray with the selective insecticides were ranged from 0.66 to 2.66, 1.00 to 4.66 and 10.00 and 23.00 for H.armigera, C.carnea and parasitization rate by T.chilonis, respectively, while the data of the current study also showed that the number of Boilogical control agents and the pest H.armigera, after second spray were fluctuated between 0.00 to 3.66, 1.00 to 6.00 and from 8.00 to 51.33 for H.armigera, C.carnea and parasitization rate by T. chilonis, respectively. Finally, data regarding the population of the test insects and yield per acre from each treatment after third spray with the same insecticides showed that the population of C. carnea were increased in all treatments after third spray except Endusilfau treated plots, on the other hand parasitization rate by T. chilonis increased in all treatment except Profenofos that reduced from 12.00 percent to 8.00 percent after third spray. Yield of seed cotton was found maximum 3200 Kg/ hectare in these plots where Thiodicarb and Spinosad were applied and next highest yield was obtained in Indoxacarb and Cypermethrin treated plots, showing a yield of 2800 Kg and 2400 Kg/ hectare, respectively. Finally the results showed that there was no difference in the yield of seed cotton between Endosulfan and Profenofos, treated compared to control plot
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
