
Pests Pree es Corbet 
FOLIAR NEMATODE 
The spread of this pest has been very rapid in recent years owing to the increased trade in chrysan- 
themums, and the ease with which the nematode is transported in plants and cuttings. Too few 
growers have become familiar with this pest and consequently no effort has been put forth to control it. 
SYMPTOMS. The leaves attacked become blotched, turn at first greenish-yellow, then brownish, later 
gray and finally black until the entire leaf dies and hangs down on the stem. Under conditions 
of high humidity, both in the open during a wet season and under glass owing to excessive water- 
ing, the spread of the pest may be extremely rapid. 
CONTROL. Sodium Selenate applied in liquid form to the soil at the rate of 1/4 gram per square 
foot of bed area is the most satisfactory control. Dissolve | pound of sodium selenate into 4!/, 
gallons of water, then take one quart of this stock solution and add to 25 gallons of water and 
this should be applied on 100 square feet of bench surface. One pound of sodium selenate will 
treat 1800 square feet. The safest method is to make 2 applications at the !/g gram rate a week or 
so apart. P40 applied at the rate of 3 pounds per 100 square feet has given fair control. Wait 2 
to 4 weeks after benching before applying. This chemical may burn some varieties. It is better 
to apply P40 in 2 applications, 7 to 10 days apart. 
MILDEW 
SYMPTOMS. Whitish powdery growth on upper surface of leaves. 
CONTROL. Spray at regular weekly intervals with a good Wettable Sulfur, 1 lb. per i00 gallons of 
water to which a good commercial spreader has been added. Fermate, | ounce to 4 gallons of 
water is effective. 
ROOT KNOT NEMATODE 
SYMPTOMS. The nematodes or eelworms bore into the roots of the plants and cause knots or galls 
to develop on the root systems. As a result the plants are weak, yellowish and stunted in growth. 
CONTROL. Steam sterilization of the soil is very effective in eliminating the nematodes. Dowfume G 
is a good soil fumigation that will kill nematodes and not do any damage to the surrounding plants. 

Mildew Dodder Growing on Mums 

