The incidence of soybean anthracnose reduces yields and leads to financial losses. Among several management practices to control this disease, use of phosphites (Phi) can act by providing mineral nutrition, inducing resistance in the host and causing direct toxicity to the pathogen. The aim of this study was to investigate the effectiveness of phosphites in the management of anthracnose in soybean pods, in the transmission of the pathogen and the activities of plant defense enzymes. Soybean plants were sprayed with potassium (KPhi), manganese (MnPhi), zinc (ZnPhi), copper (CuPhi) phosphites and fungicide epoxiconazole + piraclostrobin at V4, R1 and R3 stages and inoculated with Colletotrichum truncatum isolate in the R3 stage. The anthracnose severity, the incidence of C. truncatum in soybean seeds, activities of catalase (CAT), peroxidase (POX) and superoxide dismutase (SOD) enzymes and contents of soluble lignin and total soluble phenols were evaluated. KPhi, CuPhi and MnPhi reduced the severity of anthracnose, the transmission of the C. truncatum, increased lignin content and SOD, POX and CAT enzymatic activity. Phosphites can be utilized in the management of anthracnose in soybean.

大豆炭疽病的发病率降低了产量并导致了经济损失。在控制这种疾病的几种管理方法中，亚磷酸盐（Phi）的使用可以通过提供矿物质营养，在宿主中诱导抗药性并对病原体造成直接毒性来发挥作用。这项研究的目的是研究亚磷酸盐在处理大豆荚中炭疽病，病原体传播和植物防御酶活性方面的有效性。在V4，R1和R3阶段向大豆植物喷洒钾（KPhi），锰（MnPhi），锌（ZnPhi），亚磷酸铜（CuPhi）和杀菌剂epoxiconazole +吡咯菌酯，并在R3阶段接种盾形炭疽菌分离株。炭疽病严重程度，发病率C.元宝在大豆种子中，评估了过氧化氢酶（CAT），过氧化物酶（POX）和超氧化物歧化酶（SOD）酶的活性以及可溶性木质素和总可溶性酚的含量。KPhi，CuPhi和MnPhi减少炭疽病的严重程度，所述的传输C.元宝，增加的木质素含量和SOD，POX和CAT的酶活性。亚磷酸盐可用于大豆炭疽病的管理。