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Ask a question now... growing dwarf Hawksbeery Wonder beans \ plants were thriving to flowering stage but now have brown areas on main stems and leaf stems are falling off main stalk also have brown discoloration. Is this due to bean fly? how do it stop

Submitted: 02:50PM, 03 May 2010
Answer: Dear Jan,

How annoying to get your plants to the flowering stage and then for this to happen. It does sound like it is bean fly damage. Bean fly is a major pest in tropical and subtropical areas in Australia. The female fly lays the eggs in the young leaves. After hatching, the larvae tunnel their way to the leaf mid vein, make their way to the petiole and stem and pupate in the lower stem.

Yates do not have a spray that will control this pest. At this stage it is probably too late to spray an insecticide. Best control is when the plant is quite young, in the seedling stage. Monitor crop twice weekly. Find and remove the eggs that have been laid in the young leaves. Also look out for the adult fly. There are systemic pesticides available but check to see what he withholding period is and whether is it registered for use on young bean seedlings.

Category: Vegetables & Herbs
Tags: pests, bean fly
Answered: 01:09PM, 13 May 2010

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