University of California Agriculture and Natural Resources released information on Apr. 25 about honeydew-producing insects affecting plants in Tulare and Kings Counties during the spring season. The advisory describes how sticky substances on leaves, often accompanied by sooty mold or ants, may indicate the presence of aphids, soft scales, whiteflies, mealybugs, leafhoppers, or psyllids.
This guidance is important for gardeners and residents as some honeydew-producing insects can cause significant plant damage or even spread serious diseases. For example, Asian citrus psyllids are vectors for Huanglongbing (HLB), a disease that threatens all citrus varieties and related ornamental plants. The University advises not to move citrus plant material to prevent spreading pests like the psyllid.
The UC Integrated Pest Management site offers detailed resources for identifying and managing these pests. Beneficial insects such as lady beetles and syrphid flies play a key role in controlling populations of aphids and scales. “On a single rose plant, I’ve seen lady beetles, their eggs and larvae, syrphid flies and their larvae, all having a party on the aphids,” according to the article.
Chemical controls are discouraged due to their negative impact on beneficial insect populations. Instead, practices like washing leaves with water early in the day or using horticultural oil during dormant seasons are recommended for managing infestations without harming helpful species.
University of California Agriculture and Natural Resources secures funding through public contributions to support its programs according to the official website. The organization promotes sustainable practices aimed at strengthening resilient ecosystems and economic vitality according to its official website. It utilizes nine research and extension centers representing California’s diverse ecosystems according to its official website.
UC Agriculture and Natural Resources has gained recognition for trusted services linking research with community needs according to its official website. As part of the University of California system managing Cooperative Extension services according to its official website, it conducts over 33,000 educational events annually with more than 18,000 volunteers involved in various initiatives according to its official website.
The university encourages home gardeners not only to monitor their own gardens but also participate in broader efforts by following guidelines that limit pest spread between properties.