Fumigation investigations in California . rs. Thisdestruction was espe-cially noticeable in thesummer season of1907, when the writerwas engaged in an examination of different localities. During thefirst part of July occurred a few days of very hot weather. About. Fig. 4.—Branches of orange infested with black scale (Saisxttiaolex). (Original.) [NSECT ENEMIES OF CITRUS FRUITS. 13 a month later inspections were made throughout the lower San GabrielValley, at Pomona, Ontario, and Riverside, and in Orange this valley a large majority of the young insects \\ hich hadhatched were d
Fumigation investigations in California . rs. Thisdestruction was espe-cially noticeable in thesummer season of1907, when the writerwas engaged in an examination of different localities. During thefirst part of July occurred a few days of very hot weather. About. Fig. 4.—Branches of orange infested with black scale (Saisxttiaolex). (Original.) [NSECT ENEMIES OF CITRUS FRUITS. 13 a month later inspections were made throughout the lower San GabrielValley, at Pomona, Ontario, and Riverside, and in Orange this valley a large majority of the young insects \\ hich hadhatched were dead at this time while fully 50 per cent of the eggs haddried up. At Pomona, Ontario, and Riverside almost all the younginsects had been destroyed, and fully90 per cent of the eggs beneaththe old scales. In Orange County Dear the coast a very small per-centage of eggs was affected by this hot period, while recently hatchedyoung scales were much in evidence. The black scale occurs on awide range of hosts, including trees, shrubs, and herbaceous plants. The red scale (fig. 5) thrives exceedingly well in the drier interiorregions of southern California. Jt can be found within a few miles
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfumigation, bookyear1
