Between 1979 and 1982, H. hampei spread itself from a small area in the lowlands of central Jamaica, to the entire coffee growing region (alt. 15–1603 m) of the island. The levels of infestations in the 390 farms surveyed ranged from less than 5–100%; in plains it was about 45% but only about 3.4% at altitudes of over 1000 m. On a parish basis the infestation ranged from 2.8 to 19.17% (mean 9.45%) in June 1982, before the spraying with thiodan EC35 began.
In November 1982, 8 weeks after the last spray of the three-spray cycle, the infestation levels ranged between 1 and 20.21% (mean 9.56%). In fact, it had increased from about 6.7% in 1979 to 9.56% in 1982, despite the multi-million dollar spraying programme over 4 years. The shortcomings of the chemical control strategy are discussed and an integrated approach involving chemical and cultural practices is advocated.
No insect parasite or predator of H. hampei were found in Jamaica; the fungus Beauvaria bassiana was however, found to have inflicted 6–40% mortality in the adult borer.
