Impacto da fotofase na biologia de Mahanarva fimbriolata (Stal, 1854) (Hemiptera: Cercopidae)

• Autor(a) principal: Simões, Amanda Daniela
• Data de Publicação: 2009
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3894
• topic: Mahanarva fimbriolata; Biologia; Fotofase; Cana-de-açúcar; Resistência; Mahanarva fimbriolata; Biology; Photoperiod; Cane sugar; Resistance; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE

The species Mahanarva fimbriolata (Stal, 1854), known as the spittlebug roots, is reported as a pest in sugarcane-producing regions of the country. What strategies and tactics of management are achieved, the study of photoperiod on the biology of these cercopids becomes essential. Thus, the aim of this work: (1) determine the effect of different photophases on immature and adults of this insect, and (2) get the life table of fertility in fluctuating conditions of temperature and relative humidity (27 ± 7 ° C 90 ± 10%) and controlled photoperiod, in cultivars of cane sugar RB739735. For the phases, the shorter day length (12 h), was responsible for promoting the development period. Regardless of the number of sunny hours, in which nymphs were submitted, the cycle of these nymphs was always higher than that of males. Similarly for the longevity of females, same result was obtained, however, for a total longevity, this was significantly higher in the light regime 13:00 / 13:00. The sex ratio was similar in all photophases studied. The average total cycle, nymphs + adults who remained on treatment 12:00 / 13:00, had extended their overall development. The fecundity was the only parameter not affected by different lighting conditions. The best photoperiodic condition for the production of eggs was the normal light regime 13:00 / 12:00; the average number of diapausing eggs, there was no significant difference between the treatments tested, the same happened to the types of inviable eggs. When underwent nymphs and adults, respectively, 12:00 L/13: 00L, 13:00 L/12: 00L, 12:00 L/12: 13:00 L/13 and 00L: 00L, the values obtained for the net rate reproduction (R0) were 1.94, 2.29, 1.95 and 1.17, the finite rate (λ) was 1.017, 1.020, 1.020 and 1.008. For the intrinsic rate of increase (rm) reported values of 0.017, 0.020, 0.017 and 0.008 and the average interval between generations (T) 39.99, 40.22, 40.43 and 39.26, and the time required for the population to double in number of individuals (TD) of 40.77, 34.66, 40.77 and 91.00 days.