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The following is based largely on the author's summary of .this part of a series on investigations in south-eastern f-.ngland [cf. RAE A 54 470]. Foll...Read more
Part II: P. ulmi hatched 4-5 weeks before B. angulatus, and in years when the predator severely checked the mite predation was effective at the beginn...Read more
Part 1: The influence of routine sprays of winter wash (0.1 % DNOC+3.0% petroleum oil), lime-sulphur and captan on populations of P. ulmi and its pred...Read more