Q:

What causes black leaves on pear trees?

A:

Quick Answer

Insect damage, fungal infections, fire blight or stony pit virus can cause black leaves on pear trees. Frost damage, spider mite or pear psylla infestations, blossom blast, pear scab or sooty mold cause leaves with black tips.

Know More

Full Answer

Most often, leaves on pear trees turn black due to fire blight, a highly contagious bacterial infection. The culprit is the bacterium Erwinia amylovora. This disease not only attacks pear trees, but it endangers apple and crabapple trees as well.

Fire blight is identified early on by spots on the trees with bark that oozes a light tan material. This ooze leads to streaked bark. If left untended, the bacteria first infects open flowers and young fruit, which turn black. Eventually the leaves turn black and die as well.

Fire blight grows best during rainy weather with temperatures between 75 and 85 degrees Fahrenheit and attacks the growing wood first. In order to prevent fire blight, a gardener needs to avoid over-fertilizing or over-pruning the tree. These two actions promote growth, which creates the ideal home for the bacteria. A gardener also needs to cease watering the tree as it blossoms. If fire blight occurs, the infected growth needs to be pruned away and new blossoms sprayed.

Learn More

Related Questions

  • Q:

    How do you care for pear trees?

    A:

    Pear trees need annual pruning and proper fertilization to provide a crop of healthy fruit. The trees also need to be trained into a growth pattern that promotes healthy branch development. You need fertilizer and pruning shears or a small saw to care for a pear tree, and it takes about 30 minutes for each tree.

    Full Answer >
    Filed Under:
  • Q:

    Do Bradford pear trees bear fruit?

    A:

    Bradford pear trees were intended to be ornamental and sterile; however, they do produce fruit due to cross-pollination by cultivars like the Aristocrat and Respire, which were developed to lessen the structural weaknesses of the original tree. The fruit is round and less than 1 inch in diameter.

    Full Answer >
    Filed Under:
  • Q:

    When do pear trees blossom?

    A:

    Pear trees blossom twice a year, in the summer and in the fall. They blossom best when the fruit tree has full sun and is planted in sandy or loamy soil.

    Full Answer >
    Filed Under:
  • Q:

    How do you identify sassafras trees?

    A:

    Identify sassafras trees by examining the leaves, bark, tree height, flowers, fruit, scent and geographic location of the trees. You need a field guide for comparison. Sassafras trees are usually easy to identify by taking all of these features into consideration, with identification completed in under 30 minutes.

    Full Answer >
    Filed Under:

Explore