_Lettuce drop or rot._--This is a fungous disease often destructive in

_Lettuce drop or rot._--This is a fungous disease often destructive in
	Chapter 3. PROTECTING PLANTS FROM THINGS THAT PREY ON THEM

_Lettuce drop or rot._--This is a fungous disease often destructive in

greenhouses, discovered by the sudden wilting of the plants. It is completely controlled by steam sterilization of the soil to the depth of two inches or more. If it is not feasible to sterilize the soil, use fresh soil for every crop of lettuce.


_Hollyhock rust._--Fig. 212. Eradicate the wild mallow _(Malva		_Muskmelon diseases._--"Blight'" is a very troublesome disease. The