Georgia Peanuts: Why the Higher Acephate Rate for Thrips?

Thirps damage in peanuts. Photo: Ayanava Majumdar, Auburn University

Over the years several folks have asked why there is a difference in the recommended rate of acephate for cotton (3 oz/acre) and peanut (6-12 oz/acre). I applied acephate (97) at 3, 6, or 12 oz/acre to peanut on 10 May (16 days after planting).

The pictures below were taken on 21 May. A = untreated check, B = 3 oz acephate/acre, C = 6 oz acephate/acre, and D = 12 oz acephate/acre. The pictures may not be great, but it should be apparent that 3 oz/acre is not adequate for thrips management in peanut.

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The number of dispersing adult thrips collected on yellow sticky traps declined last week. This should result in reduced risk of injury for peanut seedlings emerging in the coming weeks.

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We have been planting peanuts with no in-furrow insecticide each week since 24 April to examine the relationship between observed thrips injury and trap capture. The pictures below show untreated peanut seedlings planted on: A = 24 April, B = 1 May, C = 8 May.

The difference in accumulated thrips in the early planted peanuts is dramatic. Adult thrips are present in the 8 May planted peanut, and we will track the progression of injury over the coming weeks. We will also continue to plant each week until June.

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