Plantwise Factsheets for Farmers
Chemical control of aphids in mango
Recognize the problem
are tiny soft-bodied insects that attack mango plants and other fruit trees by
sucking the fluid from young leaves. Their body is broadly oval and they are
only about 1 to 2.5 mm long. They are brown, reddish-brown to blackish-brown
or greyish-green to blackish-green, and covered with a light powdery dusting.
They are found on the underside of young leaves. Heavily attacked leaves
Aphids reduce the ability of the plants to
produce fruit. These insect pests can be controlled by chemicals. Spraying entire trees or plants can
be very expensive. That is why chemicals that can be taken up by the roots need
to be used. Such chemicals can be applied near
the root system, which will take up the chemical. The chemical is then
transported in the plant to the leaves, where the aphids feed. This only works
on small trees.
Dig out the soil 10-15
cm deep and 10 to 20 cm wide around the affected mango trees. These dug holes
are also called basins.
- Get the chemical
fenthion from a reliable agro-input dealer. There are many different trade
names for this insecticide.
- Mix 200 ml of the
chemical fenthion with 20 litres of water. But read the product label to
- Pour 2.5 litres of the
mixture into the dug hole around each plant and cover with soil. Do not pour
onto the ground near water sources as this is dangerous for fish, and people
that use the water.
- After this, the basin
area must be supplied with water every day for two weeks to allow the
chemical move up or ‘climb’ the tree from the roots.
- Any aphid that sucks
from the leaves will die from poisoning by the chemical.
- The chemical is
moderately hazardous so be careful not to poison yourself. You must wear a
mask, googles and gloves when handling this chemical.
- Be careful with your
chickens and beehives, as this chemical is highly toxic to both.
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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