. Florists' review [microform]. Floriculture. The Florists' OCTOBW 8, LEAF-SPOT ON MUMS. The diseased mum leaves enclosed come from Polly Rose. No other variety seems affected. Of these, we had two lots of plants benched, one older and from 3-inch pots, the other from 2-inch pots. The older and larger plants are badly affected; the younger but little, if any. Can you tell us what is the trouble f The plants have daily been given stiff sprayings of water and have also been sprayed with nicotine and fumigated with Nicofume. Can it be thripsf We are also having trouble with a small spider.
. Florists' review [microform]. Floriculture. The Florists' OCTOBW 8, LEAF-SPOT ON MUMS. The diseased mum leaves enclosed come from Polly Rose. No other variety seems affected. Of these, we had two lots of plants benched, one older and from 3-inch pots, the other from 2-inch pots. The older and larger plants are badly affected; the younger but little, if any. Can you tell us what is the trouble f The plants have daily been given stiff sprayings of water and have also been sprayed with nicotine and fumigated with Nicofume. Can it be thripsf We are also having trouble with a small spider. Is there any way to get rid of it except by stiff spraying with watert It looks much like red spider, but seems lighter in color. W. V. F. 0. The leaves sent are affected with septoria, one of the fungoid diseases, commonly known as leaf-spot. This al- ways appears at the bottom of the plant, to a greater or less degree, as the wood ripens in the fall, and is caused largely in the first place by crowding the plants, which does not permit sun and air to penetrate, rendering the leaves an easy prey to disease germs, and as the wood of the stem ripens and begins to * * bark up," as the growers call it, the nourish- ment being withdrawn from the bottom leaves causes them to die. If it does not become too bad, leaf-spot is rather an advantage than otherwise, because it compels the grower to take off the bottom leaves and give the sun and light a chance to get in. Where the disease appears in pot plants that are isolated, it is an indication that the plant htis been receiving too much water or sprayed too late in the day. Plants in the hot summer weather can hardly get too much spraying, but conditions are different when cool nights come. Polly Rose and Pacific both make heavy foliage, which accounts for their being affected when other varieties under similar conditions are not. The only remedy for leaf-spot is one of the fungi- cides sprayed carefully on the underside of the l
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Keywords: ., bookcentury1900, bookdecad, booksubjectfloriculture, bookyear1912
