Farmers sprayed lychee trees to suppress populations of scale insects. This also killed the populations of a predatory lacewing that controlled the numbers of scales. Soon, the spraying did no good, and the damage to the lychee from the scales was greater than before spraying had occurred. Few predatory lacewings exist in the trees now because...
Added by Jose Ignacio P.
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Farmers sprayed leechi trees to suppress populations of scale insects. Show more…
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