The content is just an excerpt from the complete note for JSS 1 Third Term Agricultural Science Lesson Note – Description of the Damage Done by Pests and Effects of Crop Pests on Yield. Check below to download the complete PDF
CONTENT
Sub-Topic1: Description of the damage done by pests
Crop pests do a lot of damage to crops either on the farm or in the store. The damages done by pests include:
Examples of diseases transmitted by insect are: ground nut rosette, cassava mosaic, swollen shoot of cocoa, etc.
TABLE SHOWING THE DESCRIPTION OF DAMAGES DONE BY CROP PESTS.
S/N | Crop Pest | Crop(S) Damaged | Nature of Damage Caused /Effects on Crops |
1. | Grasshoppers/locust | Cassava, yam, cowpea | · They eat vegetative parts of plants such as leaves, stems, fruits and flowers · They reduce the rate of photosynthesis · They reduce growth and yield.
|
1. | Aphids | Cowpea, soya beans, cocoa, kola, rubber, groundnut, lettuce, etc. | · They pierce plant part and suck sap and juice. · They transmit virus diseases. · They produce honey dew which spreads on the leaf and as such disturbs photosynthetic ability. |
Sub-Topic: 2. Effects of crop pests on yield.
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