Silva S E B, Auad A M, Moraes J C, Alvarenga R, Claudino S S, Resende T T
Universidade Federal de Lavras, Caixa postal 3037, Cep 37200000, Lavras, MG, Brasil.
Embrapa Gado de Leite, Av. Eugênio do Nascimento, 610, CEP 36038-330, Juiz de Fora, MG, Brasil.
J Econ Entomol. 2017 Aug 1;110(4):1877-1885. doi: 10.1093/jee/tox180.
The performance and preference of Mahanarva spectabilis (Distant) for feeding on different forage species were evaluated. The survival and duration of the nymphal period, longevity and fertility of adults, and food preferences (free choice) of adults of M. spectabilis were evaluated in a greenhouse trial, and food preferences of adults were also evaluated in laboratory tests without a choice of host plant. In the field, the numbers of plants with spittle masses were evaluated by forage sampling. Lower levels of nymph survival were observed in the greenhouse on Molasses grass, Jaraguá, Tanzânia, and Makueni. The duration of the nymphal period did not differ significantly on different forage species; however, the longevity and fertility of adults were significantly lower on Cynodon and Brachiaria decumbens Stapf. In the free-choice preference test, adult insects were attracted most strongly to B. decumbens and Jaraguá, with intermediate attraction to Brachiaria brizantha (Hochst ex A. Rich) Stapf and Pioneiro. In the test without host choice, insects exhibited lower excretion rates on Tanzânia, Cynodon, Jaraguá, B. brizantha, and Molasses grass, and those fed on Cynodon, Jaraguá, Molasses grass, and Makueni also exhibited reduced body mass. In the field, Pioneiro had the highest number of spittle masses, followed by Roxo de Botucatu. Thus, Molasses grass, Tanzânia, Makueni, and Jaraguá plants are less suitable food sources for M. spectabilis nymphs and adults. Additionally, although Jaraguá was less favorable to nymphs, it attracted food-seeking adults; hence, these plants have potential for use in control of M. spectabilis.
评估了壮观大角蝉（Mahanarva spectabilis (Distant)）对不同饲料种类的取食性能和偏好。在温室试验中评估了壮观大角蝉若虫期的存活率和持续时间、成虫的寿命和繁殖力以及成虫的食物偏好（自由选择），并且在没有寄主植物选择的实验室试验中也评估了成虫的食物偏好。在田间，通过饲料采样评估了有泡沫团的植物数量。在温室中，在糖蜜草、巴拉草、坦桑尼亚草和马库埃尼草上观察到若虫存活率较低。若虫期的持续时间在不同饲料种类上没有显著差异；然而，在狗牙根和俯仰臂形草（Brachiaria decumbens Stapf）上成虫的寿命和繁殖力显著较低。在自由选择偏好试验中，成虫对俯仰臂形草和巴拉草的吸引力最强，对巴西臂形草（Brachiaria brizantha (Hochst ex A. Rich) Stapf）和先锋草的吸引力次之。在无寄主选择试验中，昆虫在坦桑尼亚草、狗牙根、巴拉草、巴西臂形草和糖蜜草上的排泄率较低，以狗牙根、巴拉草、糖蜜草和马库埃尼草为食的昆虫体重也有所减轻。在田间，先锋草上的泡沫团数量最多，其次是罗索·德博图卡图草。因此，糖蜜草、坦桑尼亚草、马库埃尼草和巴拉草对壮观大角蝉的若虫和成虫来说是不太合适的食物来源。此外，虽然巴拉草对若虫不太有利，但它吸引觅食的成虫；因此，这些植物有用于控制壮观大角蝉的潜力。
