Ribeiro Leandro do Prado, Amandio Dylan Thomas Telles, Klock Adriana Lídia Santana, Nesi Cristiano Nunes, Rech Ângela Fonseca, Baldin Edson Luiz Lopes
Agricultural Research and Rural Extension Company of Santa Catarina, Research Center for Family Agriculture (CEPAF/EPAGRI), Chapecó, Santa Catarina, Brazil.
Federal Univ of Santa Catarina (UFSC), Florianópolis, Santa Catarina, Brazil.
Neotrop Entomol. 2022 Oct;51(5):777-794. doi: 10.1007/s13744-022-00984-5. Epub 2022 Aug 9.
This study aimed to characterize the quantitative and qualitative damage caused by Deois flexuosa (Walker) (Hemiptera: Cercopidae) adults in Axonopus catharinensis cv. SCS 315 Catarina and Cynodon dactylon (Tifton 85 and Jiggs cultivars) under different infestation densities and, consequently, the expression of tolerance-type resistance. For this purpose, potted plants were infested with different insect densities (0, 5, 10, 20, and 40 adults m). The impact of the infestation levels was assessed in the first growth cycle (10-day coexistence period) and in the regrowth (40 days after the first cut, without infestation) based on crop yield and chemical-bromatological composition as well as on photosynthetic pigments and hydrogen peroxide content. The principal component analysis relating infestation density and chemical-bromatological parameters showed a positive correlation between infestation density of D. flexuosa and the contents of neutral detergent fiber, acid detergent fiber, and the dry matter (DM). On the other hand, infestation density inversely correlated with the tillering rate, photosynthetic pigments (chlorophyll a and b, carotenoids), and iron content. In general, the impacts on DM production and chemical-bromatological composition were lower in A. catharinensis cv. SCS 315 Catarina when compared to the Cynodon species, possibly because A. catharinensis has higher tillering capacity and does not show a reduction in the photosynthetic pigments, which may act as compensating factors to D. flexuosa damage. Our results demonstrate that the A. catharinensis cultivar expresses tolerance-type resistance to D. flexuosa and constitutes an interesting option for pasturelands formation and diversification where this spittlebug species is an emerging pest.
本研究旨在描述弯曲稻叶蝉（Walker）（半翅目：沫蝉科）成虫在不同侵染密度下对卡塔琳娜地毯草品种SCS 315以及狗牙根（蒂夫顿85和吉格斯品种）造成的定量和定性损害，进而描述耐受性抗性的表达情况。为此，将盆栽植物用不同昆虫密度（0、5、10、20和40只成虫/平方米）进行侵染。基于作物产量、化学-营养成分组成以及光合色素和过氧化氢含量，在第一个生长周期（10天共存期）和再生期（第一次刈割后40天，无侵染）评估侵染水平的影响。将侵染密度与化学-营养参数进行主成分分析，结果表明弯曲稻叶蝉的侵染密度与中性洗涤纤维、酸性洗涤纤维和干物质（DM）含量呈正相关。另一方面，侵染密度与分蘖率、光合色素（叶绿素a和b、类胡萝卜素）和铁含量呈负相关。总体而言，与狗牙根品种相比，卡塔琳娜地毯草品种SCS 315对DM产量和化学-营养成分组成的影响较小，这可能是因为卡塔琳娜地毯草具有更高的分蘖能力，且光合色素没有减少，这可能是对弯曲稻叶蝉损害的补偿因素。我们的结果表明，卡塔琳娜地毯草品种对弯曲稻叶蝉表现出耐受性抗性，对于该沫蝉物种为新出现害虫的牧场形成和多样化而言，它是一个有趣的选择。
