ment. of planting stock from uncontaminated areas, which are becoming 
scarce. Control of aphids with the new phosphorus insecticides 
delays spread of the disease. Production of disease-free planting 
stock by specialists in favored locations seems to be the logical 
control practice, but little use has been made of it. 
In the Northwest necrotic fleck has been effectively excluded from 
commercial lily production areas, but the scorch disease, due to 
nutritional unbalance, has threatened the principal variety, Croft, 
grown in the region. It is manifest by an unsightly brow spotting 
in the leaves of forced lilies. The addition of lime to potting 
soils and side dressing with nitrogen fertilizers have given some 
control of the disorder. 
The Easter lily and garden lilies are subject to attack by 
botrytis blight and fusarium rot. ‘the use of the more susceptible 
lilies, such as Madonna and Testaceun, is sharply limited by these 
diseases. 
Botrytis blight causes leaf rot and flower spotting of all species 
in cool, moist weather. Easter lily blooms intended for market are 
worthiess when attacked. The causal fungus persists in debris fron 
the previous crop, and in the overwintering rosette leaves of the 
Madonna lily. Copper spreys are used to reduce damage in the cool 
Northwe st. 
Fusarium rot causes losses in warm, moist scils, It appears as 
a firm brown rot of bulbs of many species and limits their use to 
the cooler soils. Control is difficult, but retation of planting 
sites, sorting of bulbs, and treztment with thiram ara messures 
in use, 
Mint 
Rust causes losses of peppermint in Oregon end Washington. Two 
hundred acres were involved in 1919, when a new race of rust. ap- 
peared. In 1952 the disesse affected 15,400 acres, destroying 7.h 
percent of the crep. Affected leaves drop before harvesttine and 
the o11 glands on the remaining leaves are destrayed. Ne satise 
factery contre] measure is known. Many fungicides cannot he used 
because of contamination of the oil. 
Verticillium wilt disease affects both peppermint and spearmint. 
It is prevatent in Indiana wd Michigan, and a trace is now known 
to be present in Oregon. Affected plants are stunted, defoliated, 
and may be killed. Poor stands due tc winter killing add to weed- 
ing costs. Wilt is present every year, but is most severe in hot 
and dry summers, No sprays, dusts, or chemical soil treatments 
have given practical control. Crep rotation is of some value. 
