Some popular fruits and the common Insects and Diseases that can affect them

The great majority of plant diseases are what are known as fungus diseases. These are propagated by small bodies or spores, given off in various ways, which act as seeds in starting new growths. The life habits of these diseases are extremely variable and often very complex. Some of them live one generation on one plant and the next generation on some very different plant. For instance, the Apple Rust (Gymnosporangium) lives one stage on the foliage of the apple and the next on the Red Cedar, where it develops the cedar apples that produce the scarlet, gelatinous fruiting bodies commonly seen on Cedar trees in early summer. This disease may be largely avoided by destroying the Red Cedar in the vicinity of orchards.

Apple
The insects and diseases commonly attacking the apple are the codlin moth, flat headed apple tree borer, tent caterpillar, apple curculio, apple leaf lice, and among the common diseases are scab and fire blight.

Pear
Insects and diseases commonly attacking the pear are much the same as those attacking the apple. The pear is, if anything, more liable to fire blight than the apple.

Plum
The insects most injurious to the plum are the Curculio, Peach Borer, Tent Caterpillar and Leaf Lice. The diseases especially injurious to the plum are Brown Rot, Plum Pocket and Leaf Curl. Plum Knot and Shot Hole fungus.

Cherry
The insects and diseases affecting the cherry are much the same as those affecting the plum. Among the worst of these pests are the curculio, which stings the fruit; the leaf slug, which injures the foliage; borers which work in the trunk; and brown rot, which is often very destructive to the fruit just as it is ripening.

Peach & Nectarine
The trunk of the peach tree is frequently injured by the Peach Borer, and the fruit by the Curculio. The diseases of the peach are as follows: Brown Rot, Leaf Curl, Scab, Postular Spot, Yellows, Rosette, Little Peach.

Apricot
Insects and diseases affecting the apricot are practically the same as those that attack the peach but it is more liable to injuries from the Curculio.