UCCE Master Gardeners of San Joaquin County
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UCCE Master Gardeners of San Joaquin County

Posts Tagged: trees

Invasive Spotlight: Shot Hole Borers and the Diseases They Carry

Discolored patches on bark from polyphagous shot hole borer adults boring into a tree trunk. (Credit: Akif Eskalen Lab, UC Riverside)

Shot hole borers are tiny insects the size of a sesame seed that don't look particularly harmful, but don't let their diminutive size fool you. Two of these borers are invasive—the polyphagous shot hole borer and the Kuroshio shot hole borer. They...

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Posted on Thursday, June 7, 2018 at 10:00 PM
Focus Area Tags: Pest Management Yard & Garden

Asian Citrus Psyllid Found in San Luis Obispo County

Lemons on a tree. (Credit: Pixabay.com)

San Luis Obispo County has seen more than 20 detections of Asian citrus psyllid (ACP) since January 2018, according to Citrus Insider. The majority of these invasive insects have been found in the backyards of residential properties in the city of...

Lemons on a tree. (Credit: Pixabay.com)
Lemons on a tree. (Credit: Pixabay.com)

Lemons on a tree. (Credit: Pixabay.com)

Actual size of Asian citrus psyllid. (Credit: B. Grafton-Cardwell)
Actual size of Asian citrus psyllid. (Credit: B. Grafton-Cardwell)

Actual size of Asian citrus psyllid. (Credit: B. Grafton-Cardwell)

Posted on Friday, May 11, 2018 at 10:40 PM
Tags: ACP (27), Asian citrus psyllid (32), disease (30), HLB (23), huanglongbing (33), incurable (1), Nipomo (1), San Luis Obispo (3), trees (10), UC IPM (204)
Focus Area Tags: Pest Management Yard & Garden

Landscape Tree Damage: It's Not Always a Pest Issue

Fig 1. Limb dieback and sparse canopy of overwatered olive trees around which turf was planted. Unirrigated trees in the background are healthy. (Photo: L. R. Costello, UCCE)

[From the Spring issue of the UC IPM Retail Nursery & Garden Center News] Most disorders impacting landscape trees result from abiotic (non-living) disorders rather than attacks from biotic (living) pests like plant pathogens, insects, and...

Posted on Wednesday, March 14, 2018 at 11:00 PM
Tags: abiotic (4), damage (11), diseases (9), disorders (1), drought (25), Green Bulletin (3), Hartin (1), heat stress (1), landscape (22), mechanical injury (1), trees (10), UC IPM (204)
Focus Area Tags: Pest Management Yard & Garden

Pruning Trees in Winter

Pruning a tree. (Photo: Pixabay)

Winter is an ideal time to prune deciduous fruit and shade trees, since the trees are dormant and you can more easily see the tree canopy. In many cases, pruning can also help prevent or control certain insect and disease problems. For help with...

Posted on Wednesday, January 3, 2018 at 4:41 PM
Tags: apricot (4), cherry (6), disease (30), dormant (1), environmental disorders (2), fruit (35), pest (64), prune (4), pruning (4), tree (15), trees (10), UC IPM (204), winter (11)
Focus Area Tags: Pest Management Yard & Garden

Mistletoe

Mature broadleaf mistletoe plant. (Photo: Jack Kelly Clark)

Mistletoe hung in doorways is a traditional holiday decoration, but when it's growing on trees in the landscape, this parasitic plant may not seem quite as charming. There are two types of mistletoe: broadleaf and dwarf. Broadleaf mistletoe is evergreen...

Dwarf mistletoe stems and seeds on a pine branch. (Photo: Jack Kelly Clark)
Dwarf mistletoe stems and seeds on a pine branch. (Photo: Jack Kelly Clark)

Dwarf mistletoe stems and seeds on a pine branch. (Photo: Jack Kelly Clark)

Posted on Thursday, December 21, 2017 at 2:57 PM
Tags: broadleaf (1), dwarf (1), holiday (3), mistletoe (3), parasitic plant (2), trees (10), UC IPM (204)

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