Articles

DETERMINATION OF DEVELOPMENTAL AND LIFE TABLE PARAMETERS OF RHYZOBIUS LOPHANTHAE BLAISDELL (COLEOPTERA COCCINELLIDAE) ON THREE ARMORED SCALE INSECTS (HEMIPTERA DIASPIDIDAE)


Abstract


Scale insects are the most damaging pests of citrus production in Turkey. Rhyzobius lophanthae Blaisdell (Coleoptera: Coccinellidae), a polyphagous coccinellid, is one of the most important predators of these pests. In this study, the life tables of R. lophanthae on three different armored scale insects, Aonidiella aurantii (Maskell), Aspidiotus nerii Bouché, Chrysomphalus dictiyospermi (Morgan) (Hemiptera: Diaspididae), were produced. The study was conducted in a climate chamber under constant conditions of 26°C, 60% relative humidity and 16-hour photoperiod.

The net reproductive rate (R0), intrinsic rate of increase (rm) and mean generation time (T0) were 36.027, 12.520 and 6.600 females/female/generation, 0.120, 0.061 and 0.041 females/female/day, and 30.005, 41.151, 45.826 days, respectively, when R. lophanthae was reared on A. nerii, C. dictiyospermi and A. aurantii, respectively. The doubling time (DT) and finite rates of increase (λ) were 5.803, 11.286 and 16.832 days, 1.127, 1.063 and 1.042 individuals/female/day, respectively, when R. lophanthae was reared on A. nerii, C. dictiyospermi and A. aurantii, respectively.


Keywords

Aonidiella aurantii, Aspidiotus nerii, Chrysomphalus dictiyospermi, life table, Rhyzobius lophanthae.

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