engleski

Feeding damage by onion thrips Lindeman (Thysaniptera: Thripidae), on early withe cabbage groen under insecticide-feer conditions

The effects of cultivar choice and plant density on onion thrips (Thrips tabaci) damage to early with cabbage was studied on five varietes of early white cabbage grown at three different densities over two years. In the drier year the cabbage yield was smaller and greater thrips damage was recorded. The cabbage variety "Vestri", which had on average the firmest head, showed itself to be the most resistant to Thrips tabaci attack and gave the highest yield. The "Parel" variety, with the shortest growing period, was the most damaged by the thrips. Most densely planted cabbage had the lowest mean weight of heads and the lowest mean index of damage on the exterior leaves. Most of the economically important damage occurred betwee the third sixth exterior leaf, although the damage extender to the fifteenth exterior leaf.

Thrips tabaci ; onion thrips ; damage ; plant density ; early white cabbage

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