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About Melodie Putnam

Melodie Putnam is Director of the Oregon State University Plant Clinic.

Governed by Micrometeorology: Apple Scab and Spore Dispersal

Apple scab, that fungal disease known to just about anyone who had grown an apple, can convert a promising young fruit into a disfigured, unappetizing reject. Although safe to eat, in this day of readily available perfect fruit, we would rather do without scabby fruit.

By |2020-08-11T15:16:07+00:00November 19th, 2019|Plant disease|0 Comments

Propagation pitfall: Leafy gall disease

Now is the time when nurseries are propagating plants for the upcoming spring season. Odd looking plants with too many shoots or buds could be infected with the pathogenic bacterium Rhodococcus fascians. Propagators should be alert for symptoms, as shown in the gallery below, and have suspicious plants tested for the presence of the bacteria.

By |2020-08-11T15:16:07+00:00November 12th, 2019|Leafy gall, Plant disease|0 Comments

Cannabis aphid

The cannabis aphid is a pest aphid found on the leaves and stems of cannabis. Aphids have "piercing-sucking" mouthparts to feed on plant fluids. When aphids occur in high numbers, their feeding can stress plants and cause wilting, yellowing and other damage. Cannabis aphids are also potential vectors of plant pathogens.

By |2020-08-11T15:16:07+00:00November 1st, 2019|Emerging Pests, Hemp, Insects|0 Comments

Botrytis on hemp… it’s in the news!

The weather this fall has been ideal for development of molds (like Botrytis) in the tight colas of the hemp plant. The alternating cool and moist weather followed by a few clear days of moderate temperatures have been perfect for the moisture-loving fungus. Which translates to bad news for the growers, who depend on the flowers for their CBD-related products.

By |2020-08-11T15:16:07+00:00October 8th, 2019|Botrytis, Hemp|0 Comments

Missing Something: Vole damage to plants

Plants that appear to be doing well in the spring, but then crash in the heat of summer could be missing something – literally. We have received a number of different woody plants showing poor vigor, reduced growth, sun scald on the leaves or stems, small leaves, and branch dieback, all leading to a slow decline of the entire plant and eventual death.

By |2020-08-11T15:16:07+00:00September 17th, 2019|Uncategorized|0 Comments