University of Guilan Plant Pest Research 2538-6123 13 3 2023 11 22 Insecticidal and repellency properties of apple of sodom, Calotropis procera extract on greenhouse whitefly Insecticidal and repellency properties of apple of sodom, Calotropis procera extract on greenhouse whitefly 17 26 7203 10.22124/iprj.2023.25732.1536 FA F. Bagheri Department of Plant Protection, College of Agriculture, Shiraz University, Fars, Iran Z. Nouri Dehbozorg Department of Plant Protection, College of Agriculture, Shiraz University, Fars, Iran Journal Article 2023 10 07 Indiscriminate use of chemical insecticides has caused the outbreak and resistance of pests. Plant extracts can be a suitable alternative to common pesticides today. In this research, the lethality effect of <em>Calotropis procera</em> plant extract was tested by the contact method (leaf dipping) on different biological stages (first-instar nymphs and adults) on the greenhouse whiteflies, as well as the repellent effect of the extract on same-age adults in two times, consist of six and 24 hours after treatment. The experiment was conducted based on a completely randomized design with five concentrations of plant extract in four replications and 20 same-aged individuals in each replicate (for the lethality test (and 50 same-age adults (for the repellency test (in different concentrations. In these experiments, mortality of first instar nymphs was checked after 24 and after 72 hours for adult forms. The lethal concentration of 50% on the first instar nymphs and adults were 8805.110 and 7281.697 mg/L, respectively. According to the results, this extract was a lethal compound for both tested instars of greenhouse whitefly. Also, the repellent concentration of 50% of this extract was estimated at 1902.593 mg/L in adults. The repellency effect was also significant. The results show that with an increase in concentration, mortality and repellency will increase and this extract has insecticidal and repellency properties. Indiscriminate use of chemical insecticides has caused the outbreak and resistance of pests. Plant extracts can be a suitable alternative to common pesticides today. In this research, the lethality effect of <em>Calotropis procera</em> plant extract was tested by the contact method (leaf dipping) on different biological stages (first-instar nymphs and adults) on the greenhouse whiteflies, as well as the repellent effect of the extract on same-age adults in two times, consist of six and 24 hours after treatment. The experiment was conducted based on a completely randomized design with five concentrations of plant extract in four replications and 20 same-aged individuals in each replicate (for the lethality test (and 50 same-age adults (for the repellency test (in different concentrations. In these experiments, mortality of first instar nymphs was checked after 24 and after 72 hours for adult forms. The lethal concentration of 50% on the first instar nymphs and adults were 8805.110 and 7281.697 mg/L, respectively. According to the results, this extract was a lethal compound for both tested instars of greenhouse whitefly. Also, the repellent concentration of 50% of this extract was estimated at 1902.593 mg/L in adults. The repellency effect was also significant. The results show that with an increase in concentration, mortality and repellency will increase and this extract has insecticidal and repellency properties. https://iprj.guilan.ac.ir/article_7203_13b43f1c26a5354972602410967d79db.pdf