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Pests and Diseases of Plants

Apple-leaf Aphis
Bean Weevil
Blister Mite On Walnuts
Borers In Olive Twigs
Cause Of Mottle Leaf
Control Of Grasshoppers
Control Of Pear Slug
Control Of Red Spider
Control Of Squash Bugs
Cutworms And Young Trees
Depluming Mites
Finding Thrips
Formula For Lime-sulphur
Fumigating For Black Scale
Gopher Poison

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Blister Mite On Walnuts

I am sending you some walnut leaves with some swellings an them. They
are very plentiful on some trees here. Is the trouble serious and will
it spread?

This is merely Erinose, or Blister Mite, which is a very common trouble
on walnuts, but does not do enough damage to call for methods of
control. These swellings are caused by numerous, very small insects
which live within the blisters on the under side of the leaf amongst a
felt-like, heavy growth which develops there. While this effect is very
common, it produces no appreciable injury and needs no treatment for its

Next: Scale On Apricots

Previous: Woolly Aphis

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