Higher temperatures and more intense storms are also linked to "valley fever", a disease contracted from a fungus in the soil of the central valley of California.

更高的温度和更密集的风暴也与“裂谷热”有关联，“裂谷热”是一种从加利福尼亚中部峡谷土壤里的真菌上感染的疾病。

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But the farmers that grow the crop often live in drought-prone areas, where poor soil and disease exacerbate poor harvests.

但是种植玉米的农民常常生活在容易遭遇干旱的地区，那里的土壤贫瘠，而且作物疾病让不良的收成更加恶化。

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Increased soil erosion worldwide not only results in more soil being blown but spreading of disease microbes and various toxins.

全球越来越多的土壤侵蚀不仅导致了更多的土壤流失而且播散了致病微生物和各种毒素。

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The soil was not good for growing crops,and disease was destroying the plants.

VOA: special.2009.11.10

Senior manager Tshepo Ramodibe said the group hopes to use the upcoming football World Cup, being played for the first time on African soil, to broaden awareness of the disease and the way it can be prevented and treated.

VOA: standard.2010.04.23

Now, however, a new strain of the Race disease, the soil-born fungus Tropical Race Four, is making its way through the banana fields of the world, leaving devastation in its tracks.

FORBES: Banana Fungus Threatens World Crop

In addition the goal is to reduce and control these diseases: schistosomiasis, river blindness, soil-transmitted helminthes, Chagas disease and visceral leishmaniasis.

BBC: Plan to cut burden of tropical disease

It doesn't seem to be affected all that much by climate, soil conditions, geographical location, growth rate, tree size or disease.

NPR: Excerpt: 'A Splintered History Of Wood'