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Chemical control and economic damage threshold for collembola onychiurus sp in sugar beets beta vulgaris



Chemical control and economic damage threshold for collembola onychiurus sp in sugar beets beta vulgaris



Tidsskrift for Planteavl 88(5): 527-532



Damage by Collembola in sugar beets is known all over Northern Europe. The damage occurs in the spring, when the Collembola attack the seedlings. Seed dressing gives no protection when populations are dense, whereas granulated insecticides give sufficient control. The effect of 3 granulated insecticides is described and the economic damage threshold is indicated. All the seed was treated with thiram and mercaptodimethur. Four treatments were carried out: control, aldicarb (Temik 10 G), carbofuran (Curaterr) and thiofanox (Dacamox 10 G). To determine the number of soil-borne pests, soil samples were taken twice and investigated by flotation. Mostly Collembola were found. The Collembola were identified only as belonging to the Onychiurus group. As a measure of the attack, a Collembola index was worked out. The index is the average number of Collembola found in the 2 soil samples. The 3 insecticides were equally effective in depressing the level of Collembola populations, but aldicarb and thiofanox gave higher yield than carbofuran when the level of Collembola was high. The cost of the chemical treatment necessitates an increase in yield of at least 4-5% to be profitable. The economic damage threshold was set at Collembola index 8-10.

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Accession: 004937366

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