|Publication Type:||Journal Article|
|Year of Publication:||1984|
|Authors:||A. R. PANIZZI, HERZOG D. C.|
|Journal:||Annals of the Entomological Society of America|
The biology of <I>Thyanta perditor</I> (F.) was studied on <I>Bidens pilosa</I> L., wheat, and soybeans. Females collected in the field from <I>B. pilosa</I> produced significantly larger numbers of eggs and egg masses on <I>B. pilosa</I> than on wheat; on soybeans, only one pair copulated, no eggs were deposited, and longevity of adults was severely reduced. The incubation period of <I>T. perditor</I> eggs in the laboratory was 6.0 days. The durations of the first through fifth nymphal stadia on <I>B. pilosa</I> averaged 4.3, 6.3, 4.3, 4.7, and 8.9 days, respectively. Cumulative mortality reached 58%, the greatest mortality occurring in the fifth instar. Of 150 nymphs reared on soybean, none reached the fourth instar. The sex ratios of cohorts of adults collected in the field and reared in the laboratory were 1♀:1♂ and 1.2♀:1♂, respectively. The tachinid fly, <I>Eutrichopodopsis nitens</I> (Blanchard), parasitized 50.5% of the field-collected adults and the egg parasite <I>Trissolcus (Microphanurus) scuticarinatus</I> (Lima) parasitized 53% of the egg masses collected from cages in the field.