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Investigations on the organic drift in North Swedish streams
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Investigations on bollnas disease. With a preface (Swedish & German) by O. Ahlberg. II. Some new north Swedish mite species of the genus Pygmephorus


Investigations on bollnas disease. With a preface (Swedish & German) by O. Ahlberg. II. Some new north Swedish mite species of the genus Pygmephorus



Medd. Vaxtskyddsanst, Stockholm 11(72): 61-80



It is pointed out in the preface to this series-that a condition known as bollnas disease has long affected the yield of oats and pasture grasses in parts of central Sweden. It takes its name from Bollnas,, where it first became important. It affects oats at about midsummer and causes cessation of growth, so that no ears are formed. The plants become discoloured, the leaf sheaths swell and new shoots seldom develop.

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