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Showing posts from August, 2011

Junk Bugs - Lacewing Larvae - ID Photos

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This week we photographed these Junk Bugs. Junk Bugs are predatory insects found in your vineyard. These predators are the larval stage of Lacewings.
Lacewings go through complete metamorphosis (egg, larva, pupa, adult) and have at least two generations per year. The life cycle takes about 4 weeks depending on temperature. A female Lacewing can deposit over 200 eggs. In 4 to 5 days, the eggs will hatch into small junk bug larvae.
Lacewing larvae are brownish and can have dark reddish-brown stripes and spots (as shown).
They have large jaws for grasping prey and injecting a paralyzing venom. Lacewing larvae, sometimes called aphid lions, typically feed on soft-bodied insects such as aphids, mealy bugs, thrips, and Light Brown Apple Moth. The larvae develop three instars in to 3 weeks, and are 9.5 mm long when full grown. Larvae will spin a silken pale cocoon that is loosely attached to foliage. During the pupal stage they develop wings and reproductive organs.
After 5 to 7 days…

Two Chardonnay vineyards - 14 days difference.

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The most advanced Chardonnay vineyards (Left) are around the 1-2 leaf stage (EL 7-8), whilst late pruned vineyards (Right) are only at Bud-swell to Green-tip (EL 5).

It is worthwhile planning an early spray round for Powdery Mildew in vineyards that had the disease last season. This is likely to be due in 14 days for early Chardonnay vineyards.

Abandoned vineyards - time for peer pressure

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As part of CropWatch McLaren Vale and commercial monitoring I study the spread of powdery mildew (and in certain years when we have outbreaks downy mildew) from abandoned vineyards. I use these vineyards to get photos of disease and make observation of spread etc.