There's unpredictable weather, changes in soil quality, and the ever-present possibility that pests and diseases may pay a visit.

天气不可预测，土壤质量发生变化，害虫和疾病随时都可能出现。

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Pests and diseases, lack of inputs and technology, the weather and inadequate extension services have been identified as the biggest constraints.

害虫和疾病、缺乏投入和科技、气候和延伸服务不足已经被认为是最大的限制。

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Breeding is an ongoing activity because pests and diseases are always evolving and the climate is changing. We're always trying to make more productive, drought-tolerant and heat-resistant crops.

繁殖时一直延续的行为，因为昆虫和疾病总是在进化，气候也在不断的变化，所以我们尝试繁殖出大量的农作物，比如抗干和耐热的农作物。

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The state is warm, wet, and humid, all ideal conditions for the proliferation for fungi, diseases, and pests that attack tomatoes.

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Mars, along with Mondelez, has also joined with the London-based International Cocoa Organization to tackle the West African cocoa pests and diseases that cause more than 40% of global crop losses and are threatening future production in the key growing region.

WSJ: Chocolate Makers Fight for Farmers' Loyalty

The results will be used to inform future decisions relating to bee health and treatment of diseases, pests and emerging threats.

BBC: First Scottish bee health survey gets under way