Federal University of Lavras, Department of Entomology, Lavras, Brazil.
Brazilian Agricultural Research Corporation, Embrapa Dairy Cattle, Laboratory of Entomology, Juiz de Fora, Brazil.
Pest Manag Sci. 2019 Aug;75(8):2242-2250. doi: 10.1002/ps.5361. Epub 2019 Mar 14.
Several factors may degrade pastures, in particular, inadequate nutrient application and spittlebug attacks. Mahanarva spectabilis (Distant, 1909) (Hemiptera: Cercopidae), one of the species that occur in Brazil, is a limiting pest in forage production. This study analyzes the influence of fertilization with the macronutrients nitrogen, phosphorus and potassium (NPK) on the survival of M. spectabilis nymphs, and the effects of damage by nymphs and adults on the production, quality and regrowth capacity of the forages Brachiaria ruziziensis, Pennisetum purpureum and Digitaria sp.
Fertilization of the forages differentially affected damage due to spittlebug herbivory. Attacks by nymphs and adults decreased chlorophyll content, plant regrowth and forage quality, and increased injury, regardless of fertilization. The availability of nutrients in the soil not only decreased fiber content, but also increased crude protein, chlorophyll content and regrowth, even when pest infested. Soil fertilization increased the capacity of forage plants to lessen, albeit not eliminate, the effects of injury by M. spectabilis.
Forages in fertilized soil are more tolerant to attacks by M. spectabilis nymphs and adults. © 2019 Society of Chemical Industry.
有几个因素可能会导致牧场退化，特别是养分应用不足和沫蝉的侵袭。沫蝉 Mahanarva spectabilis（Distant，1909）（半翅目：沫蝉科）是在巴西发生的物种之一，是饲料生产的限制害虫。本研究分析了施用大量元素氮、磷和钾（NPK）对 M. spectabilis 若虫存活的影响，以及若虫和成虫对 Brachiaria ruziziensis、Pennisetum purpureum 和 Digitaria sp. 等牧草产量、质量和再生能力的影响。
牧草施肥对沫蝉取食造成的损害有不同的影响。无论施肥与否，若虫和成虫的侵袭都会降低叶绿素含量、植物再生和牧草质量，并增加损伤。土壤中养分的有效性不仅降低了纤维含量，而且增加了粗蛋白、叶绿素含量和再生，即使受到害虫侵袭也是如此。土壤施肥增加了牧草植物减轻 M. spectabilis 若虫和成虫侵袭的能力，尽管不能消除其影响。
施肥土壤中的牧草对 M. spectabilis 若虫和成虫的侵袭更具耐受性。© 2019 化学工业协会。
