Development of the SpittlebugMahanarva fimbriolataunder Varying Photophase Conditions

Abstract

The effects of varying photophase conditions on biological parameters of Mahanarva fimbriolata (Stal) (Hemiptera: Cercopidae), nymphs and adults were evaluated. Eggs of a late developmental stage were placed near sugarcane roots (cultivar RB739735) maintained in a greenhouse (21 ± 7° C, 90 ± 10% RH). Nymphs and adults were exposed to the following photophase conditions: a) 13:11 L:D as nymphs and adults, b) 13:11 as nymphs and 12:12 as adults, c) 12:12 as nymphs and adults, and d) 12:12 as nymphs and 13:11 as adults. Exposure of nymphs to 13 hr of light significantly reduced the duration of the nymphal stage and the number of nymphs that matured to adults. The duration of the nymphal stage was longer in individuals developing into females than in those developing into males. There was an increase in the longevity of adults kept at 13 hr of light since the nymphal stage. The average longevity of adult males and females was approximately the same. The sex ratio was similar under all photophase conditions. The life cycle of insects kept at 12 and 13 hr of light during nymphal and adult stages respectively was extended. The total life cycle was significantly longer in M. fimbriolata females than males. The different photophase conditions did not affect the reproductive potential of M. fimbriolata. Females produced more diapausing than non-diapausing eggs, except when under 13- and 12-hr light conditions. There was no significant difference in the number of diapausing and non-diapausing eggs produced by females under the other photophase conditions.

Transmission of Xanthomonas albilineans by the spittlebug, Mahanarva fimbriolata (Hemiptera: Cercopidae), in Brazil: first report of an insect vector for the causal agent of sugarcane leaf scald

“…Another possibility is the death of X. albilineans after prolonged contact with the insect vector. Mahanarva fimbriolata adults are known for injecting a toxic saliva that results in plant cell death (burning of sugarcane symptom— Simões et al 2016 ), and this saliva may also be acting as an antibiotic to X. albilineans . Therefore, further studies are needed evaluating a larger number of adults and nymphs of M. fimbriolata and longer periods for disease development for better conclusions and estimation of transmission rates.…”

Evaluación del ciclo de vida del salivazo Mahanarva andigena sobre plántulas de caña de azúcar

“…Las diferencias en la duración del estado ninfal de varias especies de salivazo reportado por diferentes investigadores pueden estar relacionadas con la temperatura, la duración del día y con las especies de plantas ofrecidas como alimento para los insectos (Simoes et al, 2013). Al respecto, Aguilera et al (1998) reportaron que el periodo ninfal de Blattella germánica (L.) fue menor en ninfas que se alimentaron con una dieta que contenía de 22 a 24 % de proteínas y se alargó de forma considerable en ninfas que han sido alimentados con alimento que no contiene proteínas.…”