Florida Agricultural Experiment Station


 The newer arsenical, zinc arsenite, has several advantages
 over lead arsenate for this work. It is cheaper in that only 1
 pound to 50 gallons of water is used. It is decidedly less poi-
 sonous to man than is lead arsenate and therefore, injurious
 effects are even less probable.
 If spraying with bordeaux mixture at this time, the arsen-
 ical, either lead arsenate, zinc arsenite, or paris green, may be
 added to the bordeaux.
 Corn as a Trap Crop.-The bollworm prefers corn, espe-
 cially sweet corn, to any crop grown in Florida. During the
 summer of 1914, some successful results were obtained in the
 use of sweet corn as a trap crop. On one small plot of toma-
 toes planted next to sweet corn which was just coming into
 silk when the earliest tomatoes were forming, there were no
 worms at all, while a field a quarter of a mile away averaged
 20 percent infested fruit. Observations would indicate, how-
 ever, that the corn must be planted very close to the tomatoes
 to provide protection. We recommend that 10 to 20 rows of
 tomatoes alternate with 2 rows of corn. If a single row of
 corn is planted across the field it usually does not get thoroly
 pollinated and the ears will not be sufficiently attractive to
 prevent the caterpillars from wandering to the tomatoes. Also
 the corn must be planted at such a season as to be in an at-
 tractive condition when the first tomatoes are forming, that is,
 it must have young silks, otherwise the insect prefers the toma-
 toes. This corn must be destroyed before it has matured
 enough to be unattractive to the worms, otherwise it will in-
 crease rather than decrease the number of worms in the toma-
 toes. Many larvae will crawl from the corn to the tomatoes,
 and many moths whose larvae matured on the corn will emerge
 from the cocoons and fly to the tomatoes. The corn can be left
 until the ears are sufficiently mature for roasting purposes, but
 by no means should they be left to ripen in the tomato field.
 Cowpeas planted in the corn will afford shade in which the
 moths can hide during the day and thus make the trap crop
 more attractive to the moths and increase its efficiency.
 Destroy Wormy Fruit.-All wormy fruit should be picked
and removed from the field, and so disposed of as to destroy the
larvae. Stock, hogs, and chickens will eat a limited amount of
these wormy tomatoes, especially if they do not have access to
other green food. Where the acreage of tomatoes is large, the
most practical method of disposing of these wormy fruits is to
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