. Fig. 165.—Left-hand fig., gooseberr}' red spider (Biyobia ribis, Thomas). Right-hand fig., eucliaris mite, bulb mite, etc. [rhizo- glyphns echinopiis). in the first instance to some error of treatment, and that the mites were simply feeding on the more or less decayed portions. It has, however, been definitely proved by Michael that the mites are the primary cause of injury, and that indeed they prefer sound bulbs. The base of the bulb and the roots are most frequently attacked, and the mites can often be seen in large numbers in the injured ' cushion ' of the bulb when a magnifying-glass is
. Fig. 165.—Left-hand fig., gooseberr}' red spider (Biyobia ribis, Thomas). Right-hand fig., eucliaris mite, bulb mite, etc. [rhizo- glyphns echinopiis). in the first instance to some error of treatment, and that the mites were simply feeding on the more or less decayed portions. It has, however, been definitely proved by Michael that the mites are the primary cause of injury, and that indeed they prefer sound bulbs. The base of the bulb and the roots are most frequently attacked, and the mites can often be seen in large numbers in the injured ' cushion ' of the bulb when a magnifying-glass is used. The mites are very minute, some- times not more than one-twentieth of an inch in length; they are yellowish-white in colour, with just a suffusion of pink, the legs and rostrum are red. The following remedial measures are given in Leaflet No. 136, Board of Agriculture and Fisheries:— I. This pest is very difficult to combat because the extremely 2 M
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Keywords: ., bookpublishernewyorkmacmillan, booksubjectplantdis, bookyear1910
