Bulletin of the of Agriculture . Characteristic Damage by the Citrus Thrips (Scirtothrips citri). Fig. 1.—Typical citrus thrips scabbing on young oranges. (Natural size.) Fig. 2.—Unusual form ofthrips injury on rough orange. Fig. 3.—Splitting of young oranges due to thrips injury. (Original.) 616, U. S. Dept. of Agriculture. Plate THE CITRUS THEIPS. 5 25 cents per box. Although in seasons such as 1911 only a smallpercentage of the fruit is culled from this cause, in one instance anentire shipment of navel oranges from a 5-year-old, untreatedorchard was refused at the eastern
Bulletin of the of Agriculture . Characteristic Damage by the Citrus Thrips (Scirtothrips citri). Fig. 1.—Typical citrus thrips scabbing on young oranges. (Natural size.) Fig. 2.—Unusual form ofthrips injury on rough orange. Fig. 3.—Splitting of young oranges due to thrips injury. (Original.) 616, U. S. Dept. of Agriculture. Plate THE CITRUS THEIPS. 5 25 cents per box. Although in seasons such as 1911 only a smallpercentage of the fruit is culled from this cause, in one instance anentire shipment of navel oranges from a 5-year-old, untreatedorchard was refused at the eastern market, with the statement thatthe oranges were too badly scabbed to be salable. In several otherorchards inspected that year from 1 to 2 per cent of the fruit wasmalformed as the result of thrips feeding. GKADE REDUCTION. The most important damage resulting from the feeding of thripsupon trees that have passed the period of rapid growth is the loweringof the market value of the fruit by unsightly scabbing and the eating quality of the orange is not affected thereby,its commercial grading is lowered considerably and the selling pricecorrespondingly reduced. EXTENT OF DAMAGE TO ORANGES IN TULARE COUNTY. In 1909 more than 80 per cent of the oranges of Tulare County,Cal., were so damaged by the citrus thrips as to lower the g
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
