Of course, biological control agents can safely be released only if it can be verified that they feed solely on the target weed.

当然，只有能够证明它们仅以目标杂草为食，生物控制剂才能安全释放。

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An added advantage of micro irrigation is weed control.

微灌的一个好处是控制杂草。

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Chemical weed killers or natural treatments like corn gluten can suppress weed growth. Dense planting of a crop can also act as a natural control.

化学除草剂或类似玉米麸等自然手段可以抑制杂草的生长。作物密集种植也能作为一种自然控制手段。

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With Roundup-ready soybeans, for example, a grower only needs to apply Roundup herbicide during planting, while traditional soybean seeds require application during planting and again while the crop is growing in order to achieve the same level of weed control.

FORBES: Commentary

's Concern brand is one of two dozen companies offering an alternative to Turf Builder in a lawn fertilizer weed-control product that is derived from corn (but kills weeds like crabgrass only as they germinate).

FORBES: Magazine Article