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Check house plants for two spotted spider mites. They thrive in a warm low humidity environment. I took this plant outside and washed it down with soapy water and a hard jet of water. Wash it several times a week. A labeled miticide spray might be needed if the washing doesn’t get them under control.
Grasses are attacked by plant pathogens too. One of the most damaging diseases to warm and cool season grasses is gray leaf spot caused by the fungus, Pyricularia. In cool season grasses, it attacks so rapidly during hot, humid weather that leaves are destroyed in a short period of time, with few leaf spots visible. Symptoms are so indistinct and variable, gray leaf spot is often misdiagnosed on cool season grasses. In the transition zone, ryegrass and tall fescue are frequent targets of this fungus. In more southern climates, St. Augustine grass is a target of gray leaf spot. Crabgrass is also a target too, but damage is usually limited to red bordered lesions on leaves. Thankfully, cooler temps and lower humidity levels, should slow or stop many plant diseases including those that attack grasses.
