by Peter H. Westigard
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Bionomics and control of the two-spotted...
Rearing and release of Coccinellids for ...
The distribution of leaves and pear psyl...
Pear psylla detection and control
Psillidy (Homoptera, Psylloidea) i͡u︡go-...
Transplanting ants to pear orchards for ...
The food of orchard birds with special r...