Diseased vegetation in yard

Asked May 30, 2016, 6:27 PM EDT

What is wrong with pear trees? How do we treat?Also what is black mold looking stuff on grass? Thank you, Sonya Olevson we live in carver , Mn carver county drop down will not work

Essex County New Jersey

1 Response


The first picture shows a slime mold on turfgrass, Slime molds are related to fungi, and common lawn slime molds include Physarum spp. and Fuligo spp. Dark gray-to-black crust-like material will form on the leaves and stems of turfgrass, often radiating out in a circular pattern on the lawn after a rainy period. The soot-type material rubs off easily on shoes and clothing. Slime molds feed on decaying organic matter splashed upon the leaves and stems, and cause no damage to the turf. They may be more common on heavily thatched or poorly drained portions of a lawn. Slime molds will dry to a dormant and invisible spore state, or can be removed from the grass by brushing with a broom or a rake. Fungicide applications are unnecessary.

The pear leaf spots may be due to an early infection with a fungal leaf spot called anthracnose. We have also seen this with insect infections of the pear blister mite. You may want to take this sample in to your closest County Extension office to have someone look at it under the microscope. either way, it will not affect the long term health of the tree.

Thank you for contacting Cooperative Extension, and I do apologize for the delay.