Resumo

JARAMILLO, JORGE L.; MONTOYA, ESTHER C.; BENAVIDES, PABLO  e  GONGORA B., CARMENZA E.. Beauveria bassiana and Metarhizium anisopliae mix to control the coffee berry borer in soil fruits. Rev. Colomb. Entomol. [online]. 2015, vol.41, n.1, pp.95-104. ISSN 0120-0488.

Beauveria bassiana and Metarhizium anisopliae are used to control the coffee berry borer (CBB). Previous work revealed that a mixture of genetically different B. bassiana strains was more virulent than the single strains. To evaluate the effect of the mix of B. bassiana and its combination with M. anisopliae for controlling the CBB, we evaluated the virulence in lab and the effect on insect oviposition. The treatments applied were: -Cenicafé mix (Bb9001, Bb9024, Bb9119), -M. anisopliae Ma9236, -Cenicafé mix with Ma9236 and -water (control). Then, three plots were established in a commercial coffee plantation, the four treatments were randomly assigned into groups with 50 trees in each plot. Every 20 days for four months, four infested berries per tree were left onto the ground and later sprayed with the treatments. Eighteen days after applications, the infestation per tree and the population inside the infested berries were evaluated. Under lab conditions, the strains and mixtures revealed mortality rates against the coffee berry borer ranged between 91% and 94% nd, Cenicafé mixture affected the insect oviposition ability up to 87%. In the field, treatment applications reduced infestation in trees ranged between 18% and 47% compared with the control; getting maximum control with the combination of Cenicafé mixture and M. anisopliae; this mixture, kept the insect levels in the crop under 6.6% and decreased the insect population in infested berries by 40%. Periodic applications of the fungi strains over infested berries on the ground, control the borer and decrease the progeny inside new infested fruits.

Palavras-chave : Biological control; Entomopathogenic fungi; Hypothenemus hampei; Colombia.

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