Aphanomyces euteiches is a destructive soilborne plant pathogen. This oomycete organism survives in the soil for decades and infects and degrades roots of plants from 11 families. Infected roots develop a golden-brown color, begin to disintegrate  and the entire root system is destroyed. Symptoms of Aphanomyces root rot are  gray and water-soaked roots and as the disease progresses, the roots become golden-brown, decayed and soft. Aboveground symptoms such as chlorosis and necrosis of leaves at the base of the plant  follows. In the advanced stages of root rot, the cortical tissue surrounding the vascular tissue begins to slough off  and can be removed easily. 

Stemphylium leaf blight (SLB), caused by Stemphylium vesicarium, is a foliar disease of onion and leek worldwide. The disease has been recently detected in Denmark in leeks.  

En række svampe som findes i korn og foder kan under særlige forhold danne forskellige  toksiner.

Der findes tre kategorier af toksiner, som kan findes i korn og foder til grise.

Toksiner fra svampe som Fusarium, stinkbrand og meldrøje dannes før høst. Toksiner, der dannes efter høst er produceret af skimmelsvampe inden for familierne Aspergillus og Penicillum. Svampene kan i vådt lagret korn producere toksinet ochratoksin A. 

Det sidste kategori findes aflatoxiner som forekommer med importerede råvarer .