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Life-stage-Dependent Secondary Responses of Some Biorational Insecticides on Trichogramma dendrolimi (Matsumura) (Hymenoptera: Trichogrammatidae)
Cansu Kandil1 , Hilal Tunca Cosic * 2
1- Ankara University Agriculture Fac. Dept of Plant Protection 06110 Ankara/ Türkiye
2- Ankara University Agriculture Faculty Dept of Plant Protection 06110 Ankara/Türkiye , htunca@ankara.edu.tr
Abstract:   (121 Views)
In the study, lethal and sub-lethal doses of Neem Azal (azadirachtin 10 g/l), Nimiks (azadirachtin 40 g/l), Nimbecidine (azadirachtin 0.3 g/l), Oread (spinosad 480 g/l), and Nostalgist BL (1.5% Beauveria bassiana strain Bb-1-) were tested on different developmental stages of the egg parasitoid, Trichogramma dendrolimi  under laboratory conditions. The lowest melanized egg were found on the larval stage of parasitoid in the 200 ml dose of Nimiks (79.17%), on 5 ml dose of Oread (75.25 %) and on 250 ml dose of Nimbecidine (79.37 %). An approximately 10-fold decrease in emergence rates was determined in the larval, prepupal and pupal stages of the parasitoid at doses of 5 ml and 6.25 ml of Oread.  The other doses of the same insecticides resulted in 100% of mortality. The longest development time of T. dendrolimi was found on Oread with 6.25 ml (11.00 days), on Nimiks with 200 ml (11.04 days), and on Oread with 5 ml (10.90 days). No significant difference was observed in the sex ratio. The longevity of T. denrolimi was shorter than that of the control for all insecticides and doses applied to the larval, prepupal and pupal stages of the parasitoid. Parasitism rates of F1 and F2 varied greatly depending on the insecticides, doses and biological stage of the parasitoid. The new crop protection strategies aim to reduce the use of chemical insecticides while supporting the combined use of biorational insecticides and natural enemies. The study offers helpful data for IPM that is focused on the ecology.  
 
Keywords: azadirahtin, spinosad, Beauveria bassiana, secondary response, Trichogramma dendrolimi
Full-Text [PDF 470 kb]   (54 Downloads)    
Article Type: Original Research | Subject: Ecology and Biological Control
Received: 2024/06/26 | Accepted: 2024/01/1
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