Abstract
Five species of immature mosquitoes were identified from semiweekly and weekly sampling of four commercial rice fields in southeastern Arkansas. Psorophora columbiae (Dyar and Knab) and Anopheles quadrimaculatus Say were most abundant. Large numbers of P. columbiae were encountered immediately following flood applications, with larvae from the upper halves of each field being older than those from the lower halves due to the time required for irrigation water to inundate the entire field. Significantly more P. columbiae larvae were found in ditch than pan samples (69 and 31%, respectively). Anopheles quadrimaculatus were collected on every sample date. Moderate numbers peaked 10 July and thereafter were very low. Young larvae predominated in samples until 10 July, when slightly more than half of the immature A. quadrimaculatus collected were third and fourth-stage larvae. Larvae sampled were evenly distributed between ditch and pan areas (49 and 51%, respectively). Culex erraticus (Dyar and Knab) larvae were also collected on every sample date at very low levels. A significantly larger proportion were taken from levee ditches than pan areas (62 and 38%, respectively). Aedes vexans Meigen and Uranotaenia sapphirina (Osten-Sacken) were collected occasionally.
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