CONTROL OF CITRUS THRIPS IN CALIFORNIA AND ARIZONA. 3 
As the young fruit appears it in turn is attacked (fig. 1), and its 
market value at maturity is much reduced by the enlarged feeding 
scars and scabbing (fig. 2). A larger percentage of small-sized fruits 
than ordinarily develop results, and there is a total loss, as the result 
of early and severe scabbing, of a proportion of the fruit. To calculate 
the damage caused by the insect in reducing the grade of the fruit, it is 
necessary to know the system of grading and the relative market value 
of the grades. Three packs are usually made in California packing 
houses at the time of this writing, these packs or grades being variously 
designated as ‘‘Fancy,”’ ‘‘Choice,”’ and ‘‘Standard”’; ‘‘Extra Fancy,” 
Fic. 2.—Mature oranges, showing injury by citrus thrips. (Original.) 
‘‘Fancy,” and ‘‘Choice”’; or ‘‘Extra Choice,” ‘‘Choice,”’ and ‘‘Stand- 
ard.’’ Whatever the terms used there is usually little difference ir 
the quality of fruit of corresponding grades at the different packing 
houses. In other cases only two divisions are made, the first grade 
generally being designated as ‘‘Orchard Run” and the second or lower 
grade as ‘‘Standard.’’ Under the latter system the quality of the 
fruit composing the first grade is about the same as would be obtained 
by placing together all the fruit of the first and second grades of the 
three-grade pack. Statistics upon the quantity of fruit shipped from 
the entire San Joaquin Valley and the prices received for it are not 
available, but from Lindsay and its tributaries 1,525 carloads of navel 
