Plantwise Factsheets for Farmers
Palm Thrips of Watermelon
Recognize the problem
Palm thrips are a major
pest of watermelon in Grenada. They mainly attack the growing tips of the vine.
The tips become brown and stop growing. This pest can destroy the entire crop
if left untreated.
Palm thrips are able to
feed and survive on most of the vegetables grown. It is very important to
remove and burn all crop residues and keep the plot free from weeds which serve
as alternate hosts. They multiply rapidly so constant monitoring is important so
that action can be taken when necessary.
crop rotation with
and burn crop residues
barriers such as corn around the plot
- Use imidacloprid (Admire) 7-10 days after transplanting as a drench. 3-5 tsp /gal
water when soil is moist.
for the pest and its natural enemies such as Orius bugs 4-5 weeks after drenching.
If natural enemy populations are high and are keeping the pest population under control,
avoid using more insecticides
infestation is high, spray pyriproxyfen (Admiral) 1-2 tsp
per gallon together with acetamaprid (Caprid) (PHI 7 days), 1tsp/gallon
nitrogen fertilizer to enable plant to recover from damage.
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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