Interações tritróficas entre Diatraea flavipennella (Lepidoptera: Crambidae), Saccharum officinarum (Poales: Poaceae) e Cotesia flavipes (Hymenoptera: Braconidae) e atividade antifúngica de compostos produzidos por Atta spp. (Hymenoptera: Formicidae) / Tritrophic interactions between Diatraea flavipennella (Lepidoptera: Crambidae), Saccharum officinarum (Poales: Poaceae) and Cotesia flavipes (Hymenoptera: Braconidae) and antifungal activity of compounds produced by Atta spp. (Hymenoptera: Formicidae)

Fernando Lucas Torres de Mesquita

Aiming to study the reproductive behaviour of Diatraea flavipennella Box, 1931 (Lepidoptera: Crambidae) in the presence and absence of three different varieties of sugarcane plants, the searching behavior of Cotesia flavipes (Hymenoptera: Braconidae) for larvae of D. flavipenella in non-infested and D. flavipennella infested sugarcane plants, the olfactive response of females of C. flavipes to hexane extracts from non-infested and infested sugarcane plants and the antifungal activity of compounds produced on the mandibular and metapleural glands of Atta spp. were carried out behavioural bioassays, dynamic headspace experiments (aerations) and antimicrobial tests under laboratory conditions. The results demonstrated that the sugarcane varieties SP79-1011, RB92-579 e RB86-7515 did not exert any influence in the calling and courtship behaviours exhibited by females and males of D. flavipennella (p>0,05), respectively. In addition, the oviposition behaviour displayed by D. flavipennella females after mating occurred on the surface of sugarcane plants leaves and the amount of eggs laid in each variety of sugarcane plant did not show any significant difference (p>0,05).Females of C. flavipes did not show preference for any variety of sugarcane plant infested by larvae of D. flavipennella, regardless of the host (larvae of D. flav pennella or larvae of D. saccharalis). Sugarcane plants infested by larvae of D. flavipennella were more attractive to females of C. flavipes than noninfested plants (p<0,05). The behavioural bioassays revealed that the hexane extracts of infested plants significantly attracted a major number of C. flavipes females than extracts of non-infested plants and control (hexane) (p<0,01).The antimicrobial tests demonstrated that all compounds present in the secretion from the manndibular and metapleural glands of Atta spp. Presented inhibitory activity for the different strains of C. albicans studied (p<0,05), specially geraniol, β- cironellol and hexanoic and octanoic acids. From these results, it is possible to conclude that the varieties of sugarcane plants studied did not influence the reproductive behavior of D. flavipennella, that infested sugarcane plants releases volatile substances responsible for the attraction of C. flavipes females and that different resistant strains of C. albicans are susceptible to the tested compounds.

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