Tortricid leaf miners in the fruit crops of Trento.
A survey of the tortricid leaf miners present in some apple orchards in the province of Trento, Italy, was carried out in 1990-92. Pandemis heparana was the most abundant species, accounting for 50-80% of the total numbers of individuals found. Adoxophyes orana was less common, never exceeding 10% of the total. Other species recorded were Archips podanus, Pandemis cerasana, Argyrotaenia pulchellana [Argyrotaenia ljungiana], Ptycholoma lecheanum and Spilonota ocellana. Notes are given on the population dynamics of the species recorded and suggestions are made for their control by the rational use of insecticides. The economic threshold proposed for the 1st generation of these pests in the Trento area was when 10% of buds and 2% of fruits were attacked.