Fonseca M G, Auad A M, Resende T T, Hott M C, Borges C A V
Entomology Laboratory, Embrapa Dairy Cattle Research Station, Juiz de Fora, MG, Brazil (
Department of Statistics, Embrapa Dairy Cattle Research Station, Juiz de Fora, MG, Brazil (
J Insect Sci. 2016 Mar 24;16(1). doi: 10.1093/jisesa/iew005. Print 2016.
The aim of this study was to determine the favorable constant temperature range for Mahanarva spectabilis(Distant) (Hemiptera: Cercopidae) development as well as to generate geographic distribution maps of this insect pest for future climate scenarios. M. spectabilis eggs were reared on two host plants (Brachiaria ruziziensis(Germain and Edvard) and Pennisetum purpureum(Schumach)), with individual plants kept at temperatures of 16, 20, 24, 28, and 32 °C. Nymphal stage duration, nymphal survival, adult longevity, and egg production were recorded for each temperature*host plant combination. Using the favorable temperature ranges for M. spectabilis development, it was possible to generate geographic distribution. Nymphal survival was highest at 24.4 °C, with estimates of 44 and 8% on Pennisetum and Brachiaria, respectively. Nymphal stage duration was greater on Brachiaria than on Pennisetum at 20 and 24 °C but equal at 28 °C. Egg production was higher on Pennisetum at 24 and 28 °C than at 20 °C, and adult longevity on Pennisetum was higher at 28 °C than at 20 °C, whereas adult longevity at 24 °C did not differ from that at 20 and 28 °C. With these results, it was possible to predict a reduction in M. spectabilis densities in most regions of Brazil in future climate scenarios.
本研究的目的是确定华丽大角蝉（Mahanarva spectabilis (Distant)，半翅目：角蝉科）发育的适宜恒温范围，并绘制这种害虫在未来气候情景下的地理分布图。华丽大角蝉的卵在两种寄主植物（鲁氏臂形草（Brachiaria ruziziensis (Germain and Edvard)）和象草（Pennisetum purpureum (Schumach)））上饲养，每株植物分别置于16、20、24、28和32℃的温度下。记录每种温度*寄主植物组合的若虫期持续时间、若虫存活率、成虫寿命和产卵量。利用华丽大角蝉发育的适宜温度范围，可以生成地理分布图。若虫存活率在24.4℃时最高，在象草和臂形草上的估计值分别为44%和8%。在20℃和24℃时，臂形草上的若虫期持续时间比象草上的长，但在28℃时相等。在24℃和28℃时，象草上的产卵量高于20℃时，象草上28℃时的成虫寿命高于20℃时，而24℃时的成虫寿命与20℃和28℃时的无差异。根据这些结果，可以预测在未来气候情景下巴西大部分地区华丽大角蝉的密度会降低。
