




CULTURED Sree? (Cia 
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WHAT IS VERTICILLIUM WILT? 

Verticillium wilt or more commonly called Seidewitz Disease, causes the margins of the leaves to turn 
yellow and eventually wilt or dry up. This begins at the base of the plant and works up the stem. 
It may affect one side of a stem or plant more than the other. There are no distinct spots on the 
leaves. Some varieties are more resistant than others. 
HOW IS VERTICILLIUM WILT SPREAD? 
Verticillium infection is either transmitted through diseased cuttings or is picked up by root infection 
from Verticillium-infected soil—it is not transmitted by air-borne or splashed spores. 
WHAT IS THE CONTROL? 
Plant only disease free, cultured cuttings in soil which has been steam sterilized. 
WHAT IS CULTURING? 
If bits of intected tissue of a cutting were partially imbedded in the gelatine-like agar medium 
which is used for growing fungi, the Verticillium grows out into the surrounding agar and can be 
accurately identified. If the tissue were not infected, no growth of Verticillium develops. Thus, the 
presence or absence of Verticillium in the basal tissues of any shoot can be rather quickly deter- 
mined, the entire process requires only 10 days. It is this process which is refrerred to as ''Culturing."' 
WHAT IS CULTURED-STOCK? 
Each cutting is carefully cultured or indexed to determine the presence or absence of Verticillium 
organism. All Verticillium free cuttings are rooted in sterilized sand and then grown in sterilized soil. 
Stock plants are grown from this healthy stock in sterilized soil. This is "Cultured Stock." 
IS THIS CULTURED-STOCK IMMUNE TO VERTICILLIUM WILT? 
If planted in properly sterilized soil it should remain free or nearly free of Verticillium, but if planted 
into old, contaminated soil, cultured stock will become infected and may appear a little better than 
the usual run of stock. 
ARE ALL VARIETIES GROWN FROM CULTURED STOCK? 
Every cutting that you receive from us has been grown from cultured stock. 

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Verticillium Wilt Kust on Chrysanthemum 

