. The potato . Potatoes. 172 The Potato The adult beetle is oval in shape, about three-eighths of an inch in length and a trifle narrower than long. The ground is yellow and the wings are marked by ten black lines running lengthwise. There are also black markings on the thorax (see Fig. 10). These insects have great power of endurance. They will walk for great distances in search of food, and it is said by direct experiment they are known to have lived thirty days without food. Their eggs are a bright yellow when fresh and the young are dark red or brown grubs with black heads and markings of
. The potato . Potatoes. 172 The Potato The adult beetle is oval in shape, about three-eighths of an inch in length and a trifle narrower than long. The ground is yellow and the wings are marked by ten black lines running lengthwise. There are also black markings on the thorax (see Fig. 10). These insects have great power of endurance. They will walk for great distances in search of food, and it is said by direct experiment they are known to have lived thirty days without food. Their eggs are a bright yellow when fresh and the young are dark red or brown grubs with black heads and markings of black spots in double rows on each side. The color be- comes lighter as the grubs mature. Control. — The Colorado potato-beetle is controlled by the use of poisonous sub- ' " stances which either in solu- FiQ. 10. Potato bug, larva and ,• • j mature beetle enlarged. tion or suspcnsion are Sprayed upon the vines. The most common of these arsenical poisons are paris green, arsenate of lead or arsenate of soda. Any one of them may be sprayed upon the vines alone or mixed with bordeaux mix- ture and applied. Poison is usually necessary only for the first two regular sprayings, but should be added at any time the larvae become numerous. The eggs should be watched carefully, and after they are well hatched and the young have begun to feed, the first application of the poison should be made. A second spraying will doubtless be necessary in ten days to two weeks. The necessity for subsequent applications of poison wUl be determined by any later appearance of the pests. The first sprayings should not be delayed too long, as the larvae develop very. 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 Gilbert, Arthur Witter, 1882-1936; Barrus, Mortier Franklin, 1879-1962; Dean, Daniel. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishernewyo, bookyear1917
