Describe the economic importance and control measures of the following (a) stem borers of cereals (b) grain weevils of stored produce (c) cotton stainer (d) cassava mealy bug

STEM BORERS OF CEREAL:
Economic importance: the larvae bore into the stems and destroy the tissues.
Control measures: (i) spray with appropriate insecticide eg. Veto X 85 (ii) practice  (iii) badly affected plants should be destroyed. Grain weevils of stored produce:

GRAIN WEEVILS OF STORED PRODUCE:
Economic importance: larvae bore into, pupate in, and feed on seed causing reduction of grain   to powder.
Control measures: (i) treat sack with lindane dust during storage at 0.5% (ii) fumigate with BHC powder
COTTON STAINER:
Economic importance: it causes leaf distortion and transmission of virus disease. It also feeds on the content of the boil.
control measure: hand picking of insects.
CASSAVA MEALY BUG:
Economic importance: strong growth disturbance of the terminal shoot. Which become  stunted and deformed, Internode length is reduced causing twisted stems
control measure: (i) early rainy season is recommended (ii) treat cuttings with hot water (250C for ten minutes) or dip into a o.1% lime throated solution to kill insects before planting

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