Plantwise Factsheets for Farmers
Thrips attack of Beans
and others, Frankliniella schultzei
Recognize the problem
are tiny, slender insects with fringed wings. They are plant feeders that feed
by puncturing their host and sucking out the cell contents. Thrips scar leaf,
flower, or fruit surfaces and can cause leaves to become papery and distorted. Infested
terminals may become rolled, and drop their leaves prematurely. Discoloured or
distorted plant tissue and black specks of faeces around
stippled leaf surfaces are clues that thrips are or were present.
attack many crops in tropics/sub-tropical areas: beans, avocado, cucumber,
grapes, Gourds, citrus etc. Thrips
prefer to feed in rapidly growing tissue. Using too much nitrogen fertilizer
can promote higher populations of thrips.
plants well irrigated, but avoid excessive applications of nitrogen fertilizer
- Apply balanced doses of fertilizers -
vigorous plants normally outgrow thrips damage
- Spray with insecticidal soaps (Safer): spray
soap water (1:9) once in a week
- Sprays must be applied thoroughly to cover
all susceptible plant tissue, such as new leaf growth and buds. On plants with
a history of severe, unacceptable damage, begin treatment early when thrips or
their damage is first observed
When using a pesticide, always wear protective clothing and follow the instructions on the product label, such as dosage, timing of application, and pre-harvest interval.
The recommendations in this factsheet are relevant to:
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