Aphides As Vectors Of “Breaking” In Tulips

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Abstract
Summary.: 1. Myzus persicae Sulz is a vector of “breaking” in tulips.2. Macrosiphum gei Koch is also a vector of “breaking” in a lesser degree.3. “Red break” and “white break” are transmitted equally by the two species.4. It is suggested that “red break” is an earlier stage in the development of the virus and that “white break” is the final stage.5. There is at present no indication that “parrot” is transmissible by these two aphid species, though no conclusion can be reached in one season.6. There is some indication that the virus can be transmitted from some varieties of tulips more readily than from others.7. Mass infection in the open gave a lower percentage of “break” khan individual infection under glasshouse conditions.8. No conclusive evidence has been obtained to show that Anuraphis tulipae B. de Fonse and Rhopalosiphoninus tulipaella Theo. convey “breaking,” but in any case they cannot be considered as important vectors.

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