Acarological Society of Iran Persian Journal of Acarology 2251-8169 8 3 2026 01 01 Comparative biology and growth rate ofthetwo predatory mites,CydnoseiusnegeviandNeoseiulus californicus(Acari: Phytoseiidae),reared on two pea cultivars 225 237 239341 10.22073/pja.v8i3.45254 EN Amira Abdel-Khalek Pest and Plant Protection Department, National Research Centre(NRC), Dokki, Cairo, Egypt;E-mails: amira_afifi777@hotmail.com, gomaa_abou64@yahoo.com, elsaidyelsayed@yahoo.com 0000-0002-6949-5983 Gomaa Abou-Elella Pests and Plant Protection Department, National Research CPest and Plant Protection Department, National Research Centre(NRC), Dokki, Cairo, Egypt;E-mails: amira_afifi777@hotmail.com, gomaa_abou64@yahoo.com, elsaidyelsayed@yahoo.comentre (NRC), Cairo, Egypt Elsayed El-Saiedy Pest and Plant Protection Department, National Research Centre(NRC), Dokki, Cairo, Egypt;E-mails: amira_afifi777@hotmail.com, gomaa_abou64@yahoo.com, elsaidyelsayed@yahoo.com Journal Article Laboratory experiments were conducted to investigate the influence of two pea cultivars, regular and sweet as substrates on biological aspects and life table analysis of two phytoseiid species, <em>Cydnoseius negevi</em> (Swirski & Amitai) and <em>Neoseiulus californicus</em> (McGregor) fed on nymphs of <em>Tetranychus urticae</em> Koch under laboratory conditions of 27 ± 1 ℃, 70–80 % RH and 16L:8D h photoperiod. The development was faster and reproduction of <em>N. californicus</em> was higher compared with <em>C. negevi</em>. The predatory mite <em>N. californicus</em> showed the highest fecundity when reared on sweet pea cultivar, while <em>C. negevi</em> exhibited the lowest fecundity when reared on regular pea cultivar. Rearing <em>C. negevi</em> on the two pea cultivars led to the greatest female longevity than that of<em> N. californicus</em>. Feeding capacity of females during oviposition period was the highest for <em>N. californicus</em> on sweet pea, but it was the lowest for <em>C. negevi</em> on regular pea cultivar. Life table analysis showed that the shortest mean generation time (<em>T</em>) for <em>N</em>. <em>californicus</em> (13.01 days) compared with <em>C. negevi </em>(14.65 days)<em> </em>on sweet pea cultivar. Also, the intrinsic rate of increase (<em>r_m</em>) of <em>N. californicus</em> was 0.29 female/female/day, but the <em>r_m</em> value was 0.24 female/female/day for <em>C. negevi</em> on sweet pea substrate. Therefore, it can be concluded that the two predatory mites,<em> C. negevi</em> and<em> N. californicus</em>, are efficient biological control agents against <em>T. urticae</em> on the two pea cultivars. https://www.persianacarology.org/article_239341_de121746f8406b09be0db9c501d2d7cc.pdf