Katono Kasifa, Macfadyen Sarina, Omongo Christopher Abu, Odong Thomas Lapaka, Colvin John, Karungi Jeninah, Otim Michael Hilary
Department of Agricultural Production, School of Agricultural Sciences, College of Agricultural and Environmental Sciences, Makerere University, P.O. Box 7062 Kampala, Uganda.
National Crops Resources Research Institute, P.O. Box 7084 Kampala, Uganda.
Insects. 2021 Jul 1;12(7):604. doi: 10.3390/insects12070604.
High populations of species in the whitefly complex Gennadius (Hemiptera: Aleyrodidae) were reported to cause severe damage to cassava in East and Central Africa. However, reasons for population increases are not well understood. We investigated the effect of cassava morphological traits, temperature, rainfall and relative humidity (RH) on the abundance of . Five cassava genotypes with varying levels of resistance to cassava mosaic disease, cassava brown streak disease, and infestation were planted in three Ugandan agro-ecological zones. The experiment was conducted in 2016 and 2017 in a randomized complete block design. Across all locations, the tallest genotype Alado alado supported the lowest number of adults. In areas with high prevalence, leaf area, leaf lobe width, and leaf lobe number exhibited significant positive effects ( < 0.001) on adult count. Positive effects of relative humidity and negative effects of temperature and rainfall on adult and nymph counts were observed in 2016 and 2017, resulting in low populations in Lira. Evidently, temperatures of 28-30 °C, rainfall of 30-150 mm and RH of 55-70%, and deployment of cassava genotypes of low plant height, large leaf area, and lobe width significantly enhanced population growth.
据报道，粉虱复合体（半翅目：粉虱科）中的高种群数量会对东非和中非的木薯造成严重损害。然而，种群数量增加的原因尚未完全清楚。我们研究了木薯形态特征、温度、降雨量和相对湿度（RH）对[粉虱名称未给出]数量的影响。在乌干达的三个农业生态区种植了五种对木薯花叶病、木薯褐色条纹病和[粉虱名称未给出]侵染具有不同抗性水平的木薯基因型。该实验于2016年和2017年采用随机完全区组设计进行。在所有地点，最高的基因型阿拉多阿拉多支持的[粉虱名称未给出]成虫数量最少。在[粉虱名称未给出]高发地区，叶面积、叶裂片宽度和叶裂片数量对[粉虱名称未给出]成虫数量呈现出显著的正效应（P<0.001）。在2016年和2017年观察到相对湿度对[粉虱名称未给出]成虫和若虫数量有正效应，而温度和降雨有负效应，导致利拉的种群数量较低。显然，28 - 30°C的温度、30 - 150毫米的降雨量和55 - 70%的相对湿度，以及种植低株高、大叶面积和裂片宽度的木薯基因型显著促进了[粉虱名称未给出]种群的增长。
