. San Jose scale [microform]. San José scale; Fruits; Insect pests; Insectes nuisibles, Lutte contre les; Pou de San José; Fruit. u HOW BAN JOfli lUT B> DUTIN0UI8HX0 HOX THI ABOVB 8CAU8. If it i« not advi«aU« to try to show how th« above four scalM may be diitiii- gniahed from one another, it is very important to give simple methods by which aaj penoB can tell if he flnda one of these whether it is the San Jos6 Scale or not Tfcf following points will enable him to do so: (1) All Ave soaleai, if the snrfaoe is rubbed, will show a small nearly orcakr srea quite different in color from the res
. San Jose scale [microform]. San José scale; Fruits; Insect pests; Insectes nuisibles, Lutte contre les; Pou de San José; Fruit. u HOW BAN JOfli lUT B> DUTIN0UI8HX0 HOX THI ABOVB 8CAU8. If it i« not advi«aU« to try to show how th« above four scalM may be diitiii- gniahed from one another, it is very important to give simple methods by which aaj penoB can tell if he flnda one of these whether it is the San Jos6 Scale or not Tfcf following points will enable him to do so: (1) All Ave soaleai, if the snrfaoe is rubbed, will show a small nearly orcakr srea quite different in color from the rest of tiie scale. This area we dudl call the exuviae, because it is due to the moulted skins {exuviae) of the insect having become worked into the covering scale and*showing through it. In the San Josi acale the exuviae is situated in, or almost in, the centire of the scale, and is yellowidi. In moat of the other four scales it is situated'a little to one side of the centre, and is either some shade of red or orange, being very rarely yellowish. Frequently it is covered over by a film which conceals it unless first rubbed gently. The color and position of the exuviae are therefore very helpful distinguishing characteristics. (2) Among the adult males and females of the San Jos6 Scale are always to be found a very large percentage of small black scales, each with a little nipple in the centre and groove around it. This has been already described, and mentioned as being also the wintering stage of this scale. If none of these small black scales are to be found the inaecte are not San Jos*, or if some are present that, roughly speak- ing, answer to this deaeription but are not black they are not San Jos& (3) Look for the adult female scales, and if these Humg^ cii«ular are more than 8 mm. about 1-lS of an inch) in diameter the scale is not San Joa^ because the adult female of tiiis is never more than 2 mm., and is usually about mm. or 1-16 of an inch in diamtter, whe
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectpests, bookyear
