PREFERENSI Tetrastichus brontispae FERRIERE TERHADAP KUMBANG JANUR KELAPA Brontispa longissima GESTRO DAN PENGARUH KERAPATAN PARASITOID

Abstract

Preferences of Tetrastichus brontispae Ferriere and the influence of population density are
important to known to determine the propagation techniques are effective and efficient. The
objective of this research were to study the stage of Brontispa longissima that most
preference by T. brontispae and ideal comparison between T. brontispae and B. longissima
for propagation. The study consisted of two parts: 1) Preferences of T. brontispae against
larvae and young pupae of B. longissima. 2) The effect of population density on the
development of parasitoid T. brontispae. Results of the studies showed T. brontispae
preference to young pupae of B. longissima compared with the fourth instar larvae and third
instar larvae for parasitization. The average number of young pupa, fourth instar larvae, and
third instar larvae were parasitization row is 4.80 ± 0.52, 2.0 ± 0.47 and 0.6 ± 0.42. The
number of adult parasitoids emerged most is the treatment with the one parasitoid female,
as many as 17.20 individual. Developmental time from egg to adult each density treatment
respectively are 17.50; 18.80; 20.80; 22.50 days, and none of adult parasitoid emerged on
the density of 9 tails parasitoid females. Population density of parasitoid T. brontispae
significantly affect the number of offspring and developmental time from egg to adult.