Diseases & insects of the home garden . be cut out ofsquash vines by slitting the stems of the vines lengthwise. After makingthe slit, portions of the vines should be covered. Help the plant to growextra roots by covering damaged stems with earth. Keep the plantsgrowing vigorously, and free from other insects and diseases. Prevention.—Plant early squash for a trap. Harrow the garden lightlyin the fall, and plow deeply in the spring to keep the moths from comingout. The dead vines and old plants should be destroyed as soon as the crop is gathered. ONIONS SMUT. — S m u tcauses the young onion])l
Diseases & insects of the home garden . be cut out ofsquash vines by slitting the stems of the vines lengthwise. After makingthe slit, portions of the vines should be covered. Help the plant to growextra roots by covering damaged stems with earth. Keep the plantsgrowing vigorously, and free from other insects and diseases. Prevention.—Plant early squash for a trap. Harrow the garden lightlyin the fall, and plow deeply in the spring to keep the moths from comingout. The dead vines and old plants should be destroyed as soon as the crop is gathered. ONIONS SMUT. — S m u tcauses the young onion])lants to die dead leaves arecovered with pimplesfull of black disease lives overwinter in the soil. Treatment. — Thereis no successful rem-edy for sick plants. Fig. 27.—Squash-vine borer: o, moth with wings spread; b, moth Prpiipntinri Plant at rest; c, egg on section of vine; rf, caterpillar or grub in squash . 1 J l vine; e, chrysalis;/.chrysalis cell from ground. Enlarged one-third. OniOUS Oil lanO. WUcre. DISEASES AND INSECTS OF THE HOME GARDEN 19 the disease has not occurred. If this cannot be done, sprinkle formal-dehyde solution (1 teaspoonful to 1 quart of water) in the drill after theseeds have been dropped and before covering, using 3 to 4 quarts of thesolution to each 100 feet of row. ONION THRIPS.—The onion thrips is a very small insect, often incor-rectly called the onion louse, which causesthe injury known as white blast, whiteblight, or silvertop. It also causes seal-lions or thick-necks. This insect oftenruins entire fields of onions. It also at-tacks cauliflower, cabbage, cucumbers,melons, pumpkins, squashes, parsley,tomatoes, kale, turnips, and seed beets. Treatment. — Nicotine sulphate (seepage 29) is used with success. ONION MAGGOT.—The onion maggot(fig. 28) is the worst northern onion eats into the bulb, starting decay,and often destroys the whole onion. Theonion maggot is the larva of a small grayfly, which looks li
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