_Decay of the Fruit_ is another serious evil. Professor Kirtland and others suppose it to be a species of fungus. Poverty of soil, and wet weather, may be the cause. If the season be unusually wet, thin the fruit, so that no two plums shall touch each other. Keep the soil properly manured, and spread charcoal or straw under the tree, and you will generally be able to preserve your fruit. _The Curculio_ is the great enemy of the plum, and frequently of all smooth-skinned fruits, as the grape, nectarine, &c. [Illustration: (1) Curculio, in the beetle-form, life-size. (2) Its assumed form when disturbed or shaken from the tree. (3) Larva, or worm, as found in the fallen fruit. (4) Pupa, or chrysalis state, in which it lives in the ground.] Many remedies are proposed: making pavements, or keeping the ground hard and smooth, under the trees; pasturing swine and keeping fowls in the plum-orchard; syringing the whole tops of the trees four or five times with lime and salt water, or lime and sulphur-water--the proportions are not material, provided it be not excessively strong. It is recommended to apply with a garden-syringe. But, as few cultivators will have that instrument, they may sprinkle the mixture on the trees in any way most convenient. Salt, worked into the soil under plum-trees, is said to destroy this insect in its pupa state. At any rate, the salt is a good manure for the plum-tree. We know a remedy for the ravages of the curculio, unfailing in all seasons and localities--that is, to kill them: spread a cloth under the tree, and with a mallet having a head, covered with India-rubber or cloth that it may not injure the bark, strike the body and large limbs sudden blows, which will so jar them as to cause the insects to fall upon the cloth, and you can then burn them. Do this five or six times in the season, commencing when the fruit begins to set, and continuing till it becomes nearly full-grown. This is best done in the cool of the morning, while the insects are still; their habits of fear and quiet, when there is a noise about, are greatly in favor of their destruction by this method. This is somewhat laborious, but is a sure remedy, and will pay well in all plum-orchards, large or small. After two or three years of this treatment, there will be few or none of those insects left.