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Tapioca

Spiralling whitefly

Symptoms of damage

Yellowing of leaves

Sooty mould in lower leaves

Dropping of affected leaves

Identification of pest

Eggs: Concentric rings covered with mealy coat

Nymph: With numerous evenly spaced short glass like rods of wax on the sides of the body

Adult: Powdery white, active during early morning hours

Management

Remove the alternate host abutilon indicum from the field

Place yellow sticky trap to attract whitefly

Whitefly

Symptoms of damage

Chlorotic spots on the leaves which latter coalesce forming irregular yellowing of leaf tissue

Severe infestation results in premature defoliation

Development of sooty mould

Vector of cassava mosaic virus

Identification of pest

Nymph: Greenish yellow, oval in outline

Adult: Minute insects with yellow body covered with a white waxy bloom

Management

Remove alternate host: Abutilon indicum

Set up yellow sticky trap

Spray any one of the following

Phosalone 35 EC @2.5 l/ha

Quinalphos 25 EC @ 2.0 l/ha

Triazophos 40 EC 2.0 l/ha

Cassava scale

Symptoms of damage

Infest stem portion

Leaves of affected plants discoloured and dry up

Stunting of plants

Identification of pest

Hard scale, oval and mussel like

Management

Selection of clean (scale free) planting material)

Destroy infested stems

Encourage coccinellid predators

Spray methyl demeton 0.25%

Cassava mealy bug

Symptoms of damage

Sucking of sap at cassava shoot tips, on the lower surface of leaves, and on stems. During feeding it injects a toxin into the cassava plant

Causing deformation of terminal shoots, which become stunted

Resulting in compression of terminal leaves into "bunchy tops"

Length of internodes is reduced, and stems are distorted

Identification of pest

Cassava mealy bug is pinkish in colour

Its body is surrounded by very short filaments, and covered with a fine coating of wax.

Management

Spray malathion or fenitrothion @1ml/ha