. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. §28 CITRUS FRUITS IN CULF-COAST STATES 15 Over a large part of its area of distribution, the cloudy- winged svhite fly occurs mixed with the common citrus white fly. As was said before, the eggs oi the cloudy-winged white i\y hatch about 2 weeks after the eggs of the conimon white fly. It would seem that by delaying the s]jra\' a]jplication for the common white fly 2 weeks, one s])ra\' a])])lication could be made to sufllce for both the common white fly £uid the cloudy-winged white fl\'.^ Such si)ra>'ing, however, while economi
. Cirtus fruits under irragation. Citrus fruits; Fruit-culture. §28 CITRUS FRUITS IN CULF-COAST STATES 15 Over a large part of its area of distribution, the cloudy- winged svhite fly occurs mixed with the common citrus white fly. As was said before, the eggs oi the cloudy-winged white i\y hatch about 2 weeks after the eggs of the conimon white fly. It would seem that by delaying the s]jra\' a]jplication for the common white fly 2 weeks, one s])ra\' a])])lication could be made to sufllce for both the common white fly £uid the cloudy-winged white fl\'.^ Such si)ra>'ing, however, while economical, is not thorough in its results and should not be resorted to, especially in the si)ring when the growth of the insects is very rapid. As soon as the eggs of the common white fly hatch the larvas develo]) ra])i(lly and ))>' the time the eggs of the clouch'- winged white fly have hatched the larvas of the common white fly are about ready to ]kiss into the i)U]}al stage. In the i)U])al stage the insects are so resistant tliat man>' of them will not be killed by the oil. It also ha] )pens that in mixed infes- tations the cloudy-winged white fly does less damage than the common citrus whit(> fly, so it is imperati\'e to control, at the most x'ulnerable ])erio(l in its life history, the l)est that does the most damage. If, however, it is desirable to economize in the a])])lication of spra>'s and make one sjjray answer for both species, the best time to s])ray is in the fall, (irowth of the insects is not so ra])id in the fall on accomit of the weather being cooler, \\1ien the s])ra\' is ai)])lied after the cloudy-winged white fly has hatched, the larvas of the comnion citrus white flies will not be so fully dev(>l()])ed as to be wholly resistant to th(> oil s])rays. In either case, spring or kill, it is far better, if lasting results are to be obtained, that thes])ray be applied when each insect can be combated most successful 1\ F!(.. 1 J expos: T IP 1?.
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Keywords: ., bookcentury1900, booksubjectcitrusfruits, booksubjectfruitcultur
