. Amis et ennemis de la ferme agricole : un texte-livre de science agricole . Les ravageurs agricoles ; les insectes utiles ; les insectes nuisibles. L'ASCOSPORE ET AUTRES CHAMPIGNONS 255 publiés que sur les pommes de cette maladie peut être prévenue par la rotation des cultures et le trempage des tubercules à être plantés dans une solution de formol de la force d'une oimce à deux litres d'eau. D theviewpointof la répartition géographique, l'alternariose de la pomme de terre semble encore plus important que le mildiou. L'ancien est distrib- nes de l'ensemble des États-Unis, tandis que le second est principalement destructeur dans New York et la Nouvelle Angleterre

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. Farm friends and farm foes : a text-book of agricultural science . Agricultural pests; Beneficial insects; Insect pests. THE ASCOSPORE AND OTHER FUNGI 255 lished that on potatoes this disease may be prevented by rotation of crops and soaking the tubers to be planted in a solution of formalin of the strength of one oimce to two gallons of water. From theviewpointof geographical distribution, the Early Blight of the Potato seems even more important than the Late Blight. The former is distrib- uted throughout the United States, while the latter is chiefly destructive in New York and New England. The Early Blight appears about the time the plants blossom, showing as small brown spots scattered over the leaves. Sometimes the spots enlarge and run. together into blotches. The whole plant is often killed long before its time, so that the tubers in affected fields are small, though there is no rotting effect on account of this disease. Fortunately, spraying with Bordeaux mixture is an efficient preventive. The Anthracnose of Beans is another widespread and im- portant disease. It is famihar to most people who have attempted to grow string beans, because the reddish brown spots upon the pods are too conspicuous to be overlooked. Sometimes the disease is called the Pod Spot. Such in- jured pods are generally worthless, and the whole crop is often ruined in wet seasons, for moisture is an important factor in the development of the parasite. When the pods are seriously affected by the fungus, . Potato Leaf affected by Early Blight. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Weed, Clarence Moores, 1864-1947. Boston ; New York : D. C. Heath & Co.

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