JS NewsPlus - шаблон joomla Продвижение

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


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



Pengaruh Panjang Stek Batang terhadap Pertumbuhan  Tunas Varietas Nenas

Ni Luh Putu Indriyani dan Sri Hadiati

Balai Penelitian Tanaman Buah Tropika


The aim of the research  was to know of  the effect of stem cutting length on varieties of pineapple shoot growth. The research was conducted at KP. Aripan,  Indonesian Tropical Fruit Research Institute,  on July 2004 to April 2005. The research used Factorial Randomized Complete Blok Design with two factors and five replications. The first factor was stem cutting length with 2 cm and 3 cm and the second factor was Queen and Cayenne varieties. The result showed that there was no interaction between stem cutting length and varieties on the pineapple shoot growth. Stem cutting 3 cm length has higher number of shoots, leaves length, leaves width, and percentage of rooted shoot than 2 cm length. Pineapples varieties were not influenced to all observed parameters. This propagation technique can be used to promote the availability of pineapple seedling especially for varieties that produce a few sucker.

Key words : ananas comosus (L.) Merr , stem cutting, variety