What are the late-stage symptoms of sclerotinia stem rot in rapeseed?

(Agricultural Wealth Network) In the late stage of the disease, the stem pith is hollowed out by decay, the cortex splits longitudinally, and after the vascular tissue is infected, oily brown small spots appear, losing their luster and turning pale yellow; in humid conditions, mycelium grows and sclerotia form. After the siliques are infected, they initially show water-soaked light brown lesions, which later turn into white diseased spots; in humid weather they become wet-rot-like, with white mycelium growing on them, and sclerotia form inside and outside the siliques. After seeds are infected, the surface is rough, grayish-white, and lusterless; some diseased seeds are wrapped in white mycelium on the outside, forming small sclerotia.