seasonal population fluctuations of the cabbage white butterfly, pieris rapae (linnaeus, 1758) and diamondback moth, plutella xylostella (linnaeus, 1758) on cauliflower cultivars
نویسندگان
چکیده
small cabbage white butterfly, pieris rapae (l.) (l.) (lep.: pieridae) and diamondback moth, plutella xylostella (l.) (lep. plutellidae) are two of the most important insect pests of the family brassicaceae. use of resistant varieties is suitable management strategy for control of these pests. in order to study the population fluctuations of p. rapae and p. xylostella, eight cultivars of cauliflower were planted in a completely randomized block design with five block and 40 plot at the shahed university research field (south of tehran) and a sampling was performed once every ten days. the highest total density of different stages of p. rapae was observed on smilla and dogol cultivars and the lowest density of total stages of this pest was observed on abre-sefid and tokita. the highest of the egg density of p. xylostella was observed on smilla and dogol cultivars and the lowest egg density was on buris and takgol cultivars. larval and pupal density of p. xylostella on smilla and dogol cultivars was more than that on other cultivars.
منابع مشابه
seasonal population fluctuations of the diamondback moth, plutella xylostella (l.) (lep.: plutellidae) in cauliflower fields of the south of tehran
the diamondback moth, plutella xylostella (linnaeus, 1758) (lep.: plutellidae) is the most destructive insect pest of crucifer plants throughout the world. in order to study its seasonal population fluctuation, sampling was conducted in the cauliflower fields of south of tehran from late may until october 2011. one hectare cauliflower field in the middle of a large field was randomly selected i...
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In the first instar, the larvae enter into the leaf parenchyma and feed between the upper and lower surfaces of leaves creating mines. In the second instar, the larvae leave the mines, and from the second to the third instar, they feed on the leaves, destroying the leaf tissue except for the upper epidermis, leaving transparent “windows” in the leaves. Fourth-instar larvae feed on both sides of...
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عنوان ژورنال:
حفاظت گیاهانجلد ۲۸، شماره ۱، صفحات ۸۷-۰
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