Pengaruh Ketiadaan Inang terhadap Biologi Reproduksi dan Perilaku Parasitoid Apanteles taragamae Viereck (Hymenoptera: Braconidae)

Apanteles taragamae Viereck (Hymenoptera: Braconidae) is a gregarious larval endoparasitoid of cucumber moth Diaphania indica Saunders (Lepidoptera: Crambidae). The success of biological control using parasitoids depends on reproductive behavior of adult female parasitoids, especially those related to the host availability that can affect oviposition behavior. The objectives of this research is to study the effect of host deprivation against reproductive capacity and searching and handling time behavior of A. taragamae. The study was conducted by depriving adult females of A. taragamae of host for 1, 2, 3, 4 days after emergence (virgin females with no oviposition experience) and experienced females. The parameters observed were the number of eggs laid and parasitization on the first day after treatment, actual fecundity, ovary egg load, potential fecundity, longevity, searching and handling time of the first host after treatment,. The results showed that host deprivation affect the number of eggs laid on the first day after treatment, ovary egg load , searching and handling time of host. Adult virgin females of A. taragamae without oviposition experience has more eggs laid on the first day after treatment, but has a slower searching and handling time for the first host after treatment than females with oviposition experience.IntisariApanteles taragamae Viereck (Hymenoptera: Braconidae) merupakan parasitoid larva utama dari Diaphania indica Saunders (Lepidoptera: Crambidae) yang bersifat gregarius. Keberhasilan pengendalian hayati menggunakan parasitoid sangat tergantung pada perilaku reproduksi imago betina parasitoid, terutama yang berhubungan dengan ketersediaan inang yang dapat memengaruhi perilaku peletakkan telur. Penelitian ini bertujuan untuk mempelajari pengaruh ketiadaan inang terhadap perilaku dan kapasitas reproduksi parasitoid A. taragamae. Penelitian dilakukan dengan cara memberikan perlakuan berupa ketiadaan inang selama 1, 2, 3, dan 4 hari setelah kemunculan A. taragamae menjadi imago (ketiadaan inang di depan) dan setelah A. taragamae mendapatkan inang terlebih dahulu (ketiadaan inang di belakang). Parameter yang diamati adalah jumlah telur yang diletakkan pada hari pertama setelah perlakuan, total telur yang diletakkan, sisa telur dalam ovari, potensi produksi telur, lama hidup imago A. taragamae, serta waktu pencarian dan penanganan inang pertama setelah ketiadaan inang. Hasil penelitian menunjukkan bahwa perlakuan ketiadaan inang memberikan pengaruh terhadap jumlah telur yang diletakkan pada hari pertama setelah perlakuan, jumlah telur yang tersisa dalam ovari, serta waktu pencarian dan penanganan inang pertama setelah perlakuan. Imago A. taragamae pada perlakuan ketiadaan inang di depan meletakkan telur yang lebih banyak pada hari pertama setelah perlakuan, namun memerlukan waktu lebih lama dalam mencari dan menangani inang pertama dibandingkan imago A. taragamae pada perlakuan ketiadaan inang di belakang.

Pengaruh ketiadaan inang terhadap tanggap reproduksi Trichogrammatoidea armigera Nagaraja dan Trichogramma japonicum Ashmed (Hymenoptera: Trichogrammatoidea) dan implikasinya terhadap penerimaan inang

Trichogrammatoidea armigera and Trichogramma japonicum are polyphagous egg parastioids, that are important as natural enemies. The objective of this research was to study the effect of host deprivation on reproductive capacity of T. armigera and T. japonicum. This study consists of 8 treatments, host deprivation : 0 hour, 1 hour, 2 hours, 3 hours, 6 hours, 12 hours, and 48 hours. Host were replaced every 24 hours. Results showed there are difference with respect of how the two parasitoids respond to the treatment. Deprivation of host for 3 hours in T. armigera resulted in the increase of egg production and parasitism rate. After 12 and 24 hours of not encountering any hosts, the numbers of eggs produced drastically decreased. Treatment on T. japonicum resulted in the reaction of fecundity and parasitism rate overall. Forty eight hours of host deprivation resulted in death of both parasitoids species within 2 days. None of the parasitoids seems to produce any egg.

Fecundity and preferential oviposition by pulse beetle, Callosobruchus maculatus F on chickpea (Cicer arietinum L.) var dollar

In a laboratory experiment female Callosobruchus maculatus distributed eggs on healthy chickpea seeds in a manner that maximizes the amount of resources allocated to each offspring under favourable condition. The female preferred seeds having more quantity of resources to meet the nutrition of her offspring, seeds having healthy seed coat over damaged ones, fresh seeds over infested seeds for laying higher number of eggs under normal day light condition over the total dark. This was more so in presence of multiple copulating males over single one. Host deprivation did not have any influence on fecundity.