Explanation

(a) Identification of Specimen;

• D is Grasshopper;
• E is Aphid;
• F is Cotton Stainer;
• G is Weevils.

(b) Type of Mouth parts possessed by specimen;

• D - Bitting and chewing
• E - Piercing and Sucking
• F - Piercing and Sucking
• G - Boring

(c) Damages done by specimens D, E, F and G to crops

Specimen D;

• Eats up the leaves and stems.
• reduces the rate of photosynthesis.
• reduces growth.
• reduces yield.

Specimen E:

• toxic saliva
• transmits diseases.
• reduces quality of boll.
• leaf distortion. 

Specimen G:

• bores holes into grains and eat them up
• Reduces the quality of stored produce
• Reduces grains to powder.

(d) Methods of controlling specimen F are:

• Hand picking.
• Spray with insecticides.

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