Malays. Appi Biol. (1997) 26(1): 39-44
EFFECTS OF GARLIC (ALLIUM SATIVUM L.) BULB VOLATILES ON DEVELOPMENT AND REPRODUCTION OF RICE MOTH (CORCYRA CEPHALONICA STAINTON)
GURUSUBRAMANIAM, G., PARTHO, P.O. and KRISHNA, S.S.*
Entomology Research Institute, Loyola College Chennai - 600 034, Tamil Nadu, India
ABSTRACT
Eggs (<24 hr old) of the rice moth Corcyra cephalonica (Stainton), when exposed to volatiles emanating from cut pieces of garlic (Allium sativum) bulbs or from residue of hexane solvent extract (fresh or 3 months old following storage undei refrigeration) of the bulbs, completely failed to hatch. Total post-embryonic development period and adult emergence ol this insect were adversely affected to varying degrees when individuals were reared for the first 2 weeks of larval life 01 for similar duration from the sixteenth day of their lives in an environment of garlic bulb volatiles. Progeny of parents exposed during adult life to the volatiles for 24 hr also had setbacks in their total pos-tembryonic developmental duration and male: female ratio. This implies a transgenerational "carry over" of the detrimental effects of garlic bulb vapours on the developmental programme of the offsprings. The principal components such as allicin, 2-propene sulfenic acid, 2-propene thiol, propylene, thioacrolein and ajoene, already known to be present in the volatiles, were presumed to be responsible for the adverse effects reported here.
ABSTRAK
Telor (umur <24 jam) daripada Corcyra cephalonice (Starinton) gagal menetas apabila didedah kepada bebawang putih (Allium sativum) yang meruap atau sisa ekstrak bebawang pelarut heksana (segar atau 3 bulan penyimpanan dalam peti sejuk). Tempoh perkembangan embrio dan kemunculan serangga dewasa adalah dipengaruhi apabila individu didedah kepada bebawang yang meruap selama 2 minggu di peringkat larva atau tempoh yang sama apabila berumur 16 hari. Progeni daripada induk yang peringkat dewasa terdedah kepada bahan meruap selama 24 jam juga memberi kesan kepada tempoh perkembangan postembrio dan nisbah jantan: betina. Ini menunjukkan kesan wap bebawang memberi kesan kepada generasi berikutnya ke atas program anak-anaknya. Komponen utama iaitu alisin, asiol 2-propan sulferik, 2-propen thiol, propilin, thioacrolein dan ajoene, diketahui wujud dalam wap dipercayai memberi kesan tersebut.
Key words: Allium sativum, Corcyra cephalonica, development, reproductive potential
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