Biology ofTrichogrammatoidea simmondsi (Hym.: Trichogrammatidae) on sorghum shoot fly,Atherigona soccata (Dipt.: Muscidae) eggs
Tóm tắt
Experiments were conducted in a rearing room to study the biology ofTrichogrammatoidea simmondsi Nagaraja (Hym.: Trichogrammatidae) on sorghum shoot fly,Atherigona soccata Rondani (Dipt.: Muscidae) eggs. Shoot fly eggs were divided in two groups: 1) eggs < 24 h old and, 2) > 24 h old eggs. Thirty eggs of each group were used in a randomized complete block design with four replicates. Shoot fly eggs less than 24 h old were preferred (73% of parasitism) over 24 h old eggs (7.25%). Three larval instars ofT. simmondsi were observed. Few eggs with twoT. simmondsi exit holes (1.87%) were recorded in > 24 h old eggs compared with < 24 h ones (3.74%). The sex ratio male: female was 1 ∶ 1.47. The development from oviposition to adult emergence ranged from 7 to 12 days (average=9.8±1.31, n=40), and the average life span of male and femaleT. simmondsi was 25±1.46 h (range 22–26 h, n=12) and 35.17±10.9 (range 25–50 h, n=28) respectively at 26° C, 60–65% R.H. and 12 ∶ 12 (L/D) photoperiod. This paper constitutes the first published information on the biology ofT. simmondsi on the sorghum shoot fly eggs.
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