Population range of cabbage (Brassica oleracea) pests and other natural enemies in two agroecosystems
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Abstract
vegetable crops all over the world. This research work was
aimed at identifying the essential insect pests affecting cabbage
(Brassica oleracea var. Capitata) and other natural enemies,
by studying population performance of the main insects and
control choices at the areas from the National Centre of Animal
and Plant Health (CENSA). Thus, two fields were selected:
one intercropped with cabbage and corn, certain weed levels
and sunflower plants, whereas another one including mustard
(Brassica sp.) between bordering weeds. A randomized block
design with fixed plants was followed. Samples were counted
and identified in the laboratory, Lipaphis erysimi and Plutella
xylostella being the main pest-causing organisms (OCP).
Lipaphis erysimi was parasitized by Diaeretiella rapae. Aphid
populations increased up to a top at mid-cycle and then it
started to decrease, meanwhile parasitoids were detected at
mid-cycle and kept a tendency to increase. Population levels
of Plutella xylostella were very low, but there were white flies
and other OCP. Population levels of aphids and other OCP
were lower in the field no. 1, which proves the positive effect
of using border areas and intercroppings in these populations.
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