Visual Monitoring Trap for European Apple Sawfly12

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Abstract
Field observations of Hoplocampa testudinea Klug, a pest of developing apple fruit, indicated that the adults were attracted to apple blossoms where they fed on pollen and where females oviposited. Spectrophotometric analysis of apple blossom parts showed a negligible amount of reflection in the UV (300–400 nm) but a large amount in the remainder of the insect visible spectrum (400–650 nm). In field tests, non-UV-reflecting white sticky-coated rectangles captured more adults than any other surfaces tested including: yellow, red, orange, black, green, and blue enamels; various day-light fluorescent hues; various UV-reflecting white pigments; aluminum foil; and clear Plexiglas®. We conclude that the most preferred white rectangle could be utilized effectively to trap and monitor adults in apple orchards.

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