The book The Injurious Insects And Plant Diseases was written by author William Bradford Alwood Here you can read free online of The Injurious Insects And Plant Diseases book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is The Injurious Insects And Plant Diseases a good or bad book?
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The lice invariably gather at such points and persist throughout the year in the wounds of this character, or those made from other causes. The colony represented on the side branch at the base of a Digitized by Google 14 leaf is typical of the summer colonies. These rarely make large galls, but become at times very numerous in individuals and pro- duce many winged migrants in the late season. The root is, how- ever, the special seat of attack by this insect in our nurseries. On the roots where...ver attacked characteristic galls or swellings are produced. These may be prominent about the crown of the plant, as well as on the tap root and side branches. This condition is shown in figure 13. A comparison with figures of crown gall will show cloarly discemable differences between the two troubles. The full-gro^Ti female louse and the pupal form are. shown ^t- figures 14 and 15 respectively. The long wax threads and downy' ^#^f«ff»ff7ri««i»»k«#cMifirii Fig. 16.— WiDged Agamic Female of Woolly Aphis, much enlarged.
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