Abstract
Application of broad spectrum synthetic insecticides can disrupt the success of beneficial insects along with resurgence of pest because of their toxic effects on biocontrol agents. The sustainable pest management in agro-ecosystem demands parallel assessment of toxic impact of insecticides to target pests and their key biocontrol agents before integrating them with insecticide use in crops. Here sub-lethal effects of profenofos, citrus oil and their mixture at their sub-lethal concentration level (LC25) recorded for citrus mealybug were assessed against adults of Cryptolaemus montrouzieri Mulsant (Coleoptera: Coccinellidae) and second instar larvae of Chrysoperla carnea Stephen under laboratory conditions through consumption of treated Planococcus citri individuals. Feeding rate significantly reduced when C. montrouzieri and C. carnea were fed separately on mealybug (preys) exposed to sub-lethal concentration of profenofos, citrus oil and their mixture. Maximum prey consumption (33.10 ± 0.8, 16.05 ± 0.30 mealybug numbers) was observed in citrus oil treatment followed by single treatment of profenofos (21.05 ± 0.80, 10.85 ± 0.30) when compared with control (40.15 ± 0.80, 24.85 ± 0.30) (untreated) for C. montrouzieri and C. carnea, respectively after 24 h. Lowest number of P. citri consumption was assessed in mix of profenofos with citrus oil (15.15 ± 0.80, 7.75 ± 0.30) for C. montrouzieri and C. carnea respectively. Mortality of both predators was influenced by ingestion of contaminated mealybug such as least mortality (15%, 35%) was recorded with citrus oil while maximum (25%, 60%) in mixture of profenofos compared to control (10%, 30%) for C. montrouzieri and C. carnea, respectively. Predator preferences behavior also showed avoidance response towards profenofos and its mix with citrus oil as both predators spent maximum time (minutes) on leaves treated with citrus oil followed by profenofos whereas least was observed on mix of profenofos with citrus oil when compared with untreated leaves (control). Citrus oil alone at sub-lethal concentration may be utilized with both C. montrouzieri and C. carnea. From present findings, use profenofos even at sub-lethal concentration should be avoided when C. montrouzieri adult and /or larvae of C. carnea may be used for mealybug suppression.
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RB is thankful to the PMAS Arid Agriculture University Rawalpindi, Pakistan for facilities to perform her research work. She is also obliged to her University for study leave during her research studies.
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Bibi, R., Ahmad, M., Gulzar, A. et al. Effect of profenofos and citrus oil on Cryptolaemus montrouzieri Mulsant and Chrysoperla carnea Stephens, key predators of citrus mealybug, Planococcus citri (Risso), under laboratory conditions. Int J Trop Insect Sci 42, 379–387 (2022). https://doi.org/10.1007/s42690-021-00555-y
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DOI: https://doi.org/10.1007/s42690-021-00555-y