Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 THE INSECT WORLD. l^l to reach the iiia_oL>ots just when tlu-y are hatchuior, and becomes effecti\'e for that reason. AppHcd later, when the insects have already made tlieir way into the radishes, it would be useless. Here tiie farmer must necessarily make a few observations of his own to determine the proper time for applying the fertilizer remedy, and this is not difficult. The flies lay the eggs in l
Economic entomology for the farmer Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomol00smit Year: 1906 THE INSECT WORLD. l^l to reach the iiia_oL>ots just when tlu-y are hatchuior, and becomes effecti\'e for that reason. AppHcd later, when the insects have already made tlieir way into the radishes, it would be useless. Here tiie farmer must necessarily make a few observations of his own to determine the proper time for applying the fertilizer remedy, and this is not difficult. The flies lay the eggs in little masses on the surfice of the ground near to the infested plants. They are white, slender, and cylindrical, nearly one-sixteenth of an inch in length, and quite visible on close examination. When these eggs are found generally distributed over the fields the time to make the insecticide application has arrived, because they hatch only a few days after they are laid, and the young larvae must be reached then or not at all. The carbolic acid emulsion diluted thirty-five times may also be applied with good prospects of success in killing the maggots, or the ground tobacco may be used over the rows just as soon as the plants are up. The onion-maggot, Phorbia ceparian, is, perhaps, next in im- portance, and its habits are essentially the same as those given for the cabbage-maggot,—that is, the eggs are laid by the fly quite early in spring, next the onion stems or ^'^- 42o- leaves at the surface of the ground, and prefer- ably in young onion beds. In the latitude of New Jersey this occurs in May, but the date va- ries somewhat accord- ing to the season and to the time at which these plants are started. The larvee w^ork their way into the bulb at once and begin their scraping and gnawing, leading to the rapid decay and death of the plant. Matters are even more serious here than in the cabbage, because where a bulb has been started in decay, it usually continues, even if the ma
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