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Preference of the Metallic Blue Ladybeetle Curinus coeruleus Mulsant for Different Nymphal Instars of Diaphorina citri Kuwayama (Homoptera: Psyllidae)

A. Soemargono, R. Ibrahim, Y.B. Ibrahim, and M.S. Osman

ABSTRACT...

The preference of the metallic blue ladybeetle, Curinus coeruleus Mulsant for Asian citrus psyllid, Diaphorina citri Kuwayama was investigated in the insectary. The aim was to determine whether there was any preference by C. coeruleus at different stages for different instars of the psyllid D. citri. The 1st and 2nd instar larvae exhibited preference for smaller-sized prey, while the 3rd and 4th instar larvae and adult mostly preferred the 4th and 5th instar nymphs. The highest preference value recorded for each stage of the predator, 1st to 4th instar larvae and adult, were 0.49, 0.29, 0.33, 0.33 and 0.34, respectively on the 1st, 2nd, 4th, 4th and 4th instar nymphs. The probability of capture indicated significant differences among prey instars captured by each stage of predator. The 1st and 2nd instar larvae captured significantly more 1st and 2nd instar nymphs than the other instar nymphs. In contrast, 3rd and 4th instar larvae and adult predator captured significantly more 4th and 5th instar nymphs. Hence, the results suggest that C. coeruleus exhibited body size preference for D. citri nymphs comparable to or slightly smaller than predator's size (stages). This preference was due to the probability of success in capturing the prey.

Key words: Preference, Curinus coeruleus, Diaphorina citri, prey, preference, probability of capture

Journal of Bioscience, 17 (2): 21-29, 2006. ISSN 2180-4249

2014


 

Life Table and Demographic Parameter of the Metallic Blue Ladybeetle, Curinus coeruleus Mulsant fed with the Asian Citrus Psyllid, Diaphorina citri Kuwayama

A. Soemargono, R. Ibrahim, Y.B. Ibrahim, and M.S. Osman

ABSTRACT...

Life table parameters were calculated for the blue metallic ladybeetle, Curinus coeruleus (Mulsant) fed the Asian citrus psyllid, Diaphorina citri at temperature 28-30°C and 78-85 % RH and natural photoperiod in the insectary of Faculty of Agriculture, University Putra Malaysia. The results showed that development of immature stages took 19.1 ± 0.3 days; adult mated females lived for 34.2 ± 4.7 (range 24 – 39) days and produced a mean of 80.3 ± 13.6 progeny per female, with a sex ratio of 1 : 1.8 (♂ : ♀). The net reproductive rate (R0) was 59.08 and the capacity for increase (rc) 0.113. The finite rate of increase (l) was 1.29/female/day while the intrinsic rate of natural increase (rm) was 0.116/female/day. Thus, each female contributed 60.24 individuals to the population in a mean generation time of 35.33.

Key words: Curinus coeruleus, Diaphorina citri, life table, intrinsic rate of natural increase, progeny, generation time

2014