SEASONAL ABUNDANCE AND RESPONSE OF DIAMONDBACK MOTH, PLUTELLA-XYLOSTELLA (L) (LEPIDOPTERA, PLUTELLIDAE), AND NATURAL ENEMIES TO ESFENVALERATE AND BACILLUS-THURINGIENSIS SUBSP KURSTAKI BERLINER IN COASTAL SOUTH-CAROLINA
Ae. Muckenfuss et Bm. Shepard, SEASONAL ABUNDANCE AND RESPONSE OF DIAMONDBACK MOTH, PLUTELLA-XYLOSTELLA (L) (LEPIDOPTERA, PLUTELLIDAE), AND NATURAL ENEMIES TO ESFENVALERATE AND BACILLUS-THURINGIENSIS SUBSP KURSTAKI BERLINER IN COASTAL SOUTH-CAROLINA, Journal of agricultural entomology, 11(4), 1994, pp. 361-373
Seasonal abundance of diamondback moth (DBM), Plutella xylostella (L.)
(Lepidoptera: Plutellidae), the parasitoid Diadegma insulare (Cresson
) (Hymenoptera: Ichneumonidae) and a major predator Pardosa milvina (H
entz) (Araneae: Lycosidae) was monitored in field plots of esfenvalera
te-treated, Bacillus thuringiensis-treated and untreated collards (Bra
ssica oleracea L.). Diamondback moth populations were kept below the a
ction threshold (< 1.0 larva per plant) by indigenous natural enemies
in plots were applications of esfenvalerate were avoided. Late season
resurgence of DBM populations occurred in esfenvalerate-treated plots
in each of three seasons. Numbers of DBM larvae and pupae were signifi
cantly lower (P < 0.05) in all three seasons in Bacillus thuringiensis
-treated plots and in two of three seasons in untreated plots. Percent
parasitization was significantly lower (P < 0.05) in esfenvalerate-tr
eated plots during the late season resurgence in two of three seasons.
Esfenvalerate significantly reduced (P < 0.05) numbers of P. milvina,
one of the most abundant preators of diamondback moth.