. Bulletin. Agriculture -- New Hampshire. soon as one of these troubles occurs, either destroy the plant and get a clean one in its place or isolate the sick plant. Mealybugs may be killed one at a time by pricking with a toothpick, but this is a long, tedious process requiring several weeks or even months to get a plant entirely clean. By far the easiest method for controlling mealybugs on African violets is to obtain clean plants and keep them clean by never letting them come in contact with other plants that are infested with mealybug. kV#a. Fig. lOd—A normal African violet (center) compare
. Bulletin. Agriculture -- New Hampshire. soon as one of these troubles occurs, either destroy the plant and get a clean one in its place or isolate the sick plant. Mealybugs may be killed one at a time by pricking with a toothpick, but this is a long, tedious process requiring several weeks or even months to get a plant entirely clean. By far the easiest method for controlling mealybugs on African violets is to obtain clean plants and keep them clean by never letting them come in contact with other plants that are infested with mealybug. kV#a. Fig. lOd—A normal African violet (center) compared with an in- jured plant (left) watered with cold water. On the right is a plant infested with mites The cyclamen mite cannot be seen with the naked eye but the trouble if causes is easily recognized. The basal portion of the upper surface of the leaves, near their junction with the petioles, first develops an unusual fuzziness. The leaves, especially the new and tender ones, begin to curl and, in severe cases, the leaves become so deformed and crowded that flower stems cannot get through them. The mite usually comes in on new plants, hence a good argument for quarantining until they have proved to be clean. The cyclamen mite is spread primarily by contact or handling. There is no satisfactory method for controlling cyclamen mite under home conditions, so plants showing cyclamen mite injury should be discarded as soon as discovered. Leaf Spot Although not giving appreciable trouble to the growers in this ex- periment, leaf spot is a rather common trouble on African violet. It ap- pears as yellowish-white spots or blotches on the leaves and may cover almost the entire plant in severe cases. Contrary to popular belief, this trouble is not caused by water on the leaves. Workers at the Ohio Ex- periment Station have produced the trouble by watering plants with cold water. They have been unable to produce leaf spot on African vio- let when watering with warm water even when the l
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