The diamondback moth (DBM; Plutella xylostella), which breeds prolifically and whose larvae are highly destructive, is the number one pest of brassicas in South Africa.
Young plants are particularly vulnerable. DBMs lay their eggs in small clusters on the young leaves and the larvae later hatch and eat holes in the leaves. These holes expand as the leaves grow, reducing the leaf area and, consequently, the yield.
The larvae prefer to feed on the underside of the leaves, leaving the upper epidermis in place; this gives the appearance of little translucent ‘windows’.
Because they feed under the leaves, especially when these leaves are just above the ground, it is extremely difficult to reach DBMs with insecticides.
This story is from the 16 June 2023 edition of Farmer's Weekly.
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This story is from the 16 June 2023 edition of Farmer's Weekly.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 8,500+ magazines and newspapers.
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