"Onion thrips are
the most destructive pest of onions in Utah, not only for their heavy feeding,
but because they vector the iris yellow spot virus. They thrive in hot, arid
conditions. Feeding symptoms include whitish streaking of the foliage, plant
wilting, and during July and August (when bulbs are rapidly enlarging), reduced
bulb size due to loss of plant vigor."- Utah State Extension Small Fruits and Vegetables IPM
Advisory
Don't let the thrips get
you down! There are some great resistance techniques that are completely
organic. If you already see them, use your hose to spray a hard stream of water
on your plants. Spraying heavily will dislodge and drown them. By applying
straw mulch, you can severely reduce thrip populations. To avoid thrips in the
future, plant your onions with your carrots. Companion planting is a great way
to avoid pests!
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