Aphides as Vectors of “Breaking” in Tulips. II.

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Abstract
Summary.: Three types of “breaking” are distinguished—full, “self and “clotted.” The evidence points to “full break” being the product of two viruses. “Self breaking” may be selectively transmitted by the aphis vectors Myzus persicae Sulz and Macrosiphum gei Roch. “Self break” tulips only transmit “self breaking.” “Clotting” is an expression of “full break” in certain varieties. Anuraphis tulipae B. de Fonsc. is a definite vector in the bulb store but not on the growing plant. At a certain stage of growth tulips cease to be susceptible to infection.

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