Collection, storage and handling of plant genetic resources and their global distribution are essential components of international crop and tree improvement programmes.

植物遗传资源的收集、存储和处理以及它们在全球的分布，是国际作物和树木改良计划的重要成分。

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Meanwhile, pests such as tree-killing beetles and crop-killing fungi will both increase their range and breed more rapidly.

同时，专杀树林的甲壳虫和专杀作物的真菌都会扩大活动范围，也会更加迅速繁殖。

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Pecans are the only major tree nut native to the U.S., which produces about 80 percent of the world's crop.

美国山核桃是起源于美国的主要坚果树种，全世界百分之八十的山核桃产量来自于美国。

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During an on-crop year, growers often treat the fruit so it can stay on the tree longer.

VOA: special.2009.11.10

Alternate bearing is when a tree produces a heavy crop one year, called an "on-crop,"

VOA: special.2009.11.10

The knowledge behind the practice of building the daldal is now known to all male members of the community, but some Irob men are regarded as more skilful than others in adapting and improving the daldal and in experimenting with different ways of using the niches that they have created for crop, grass and tree production.

UNESCO: Title

Timberland and Smallholder Farmers Alliance are helping local farmers learn how to improve crop yields, develop eight community tree nurseries and support agricultural training centers in the region.

FORBES: Timberland Helps Plant 2.2 Million Trees In Haiti