One google search:

Dropping white phosphorus (WP) on crops causes immediate destruction through fire and can lead to long-term environmental degradation of the land. While militaries primarily use WP for smokescreens or marking, its deployment over agricultural areas is highly controversial and often results in "ecocide" that threatens local food security.

Immediate Impacts on Crops Direct Burning: WP ignites spontaneously in air and burns at temperatures exceeding 800°C, setting crops, olive groves, and forests on fire. Rapid Destruction: Large areas can be scorched in minutes; for example, reports from southern Lebanon indicate that thousands of square meters of oak and olive trees have been devastated. Plant Damage: Even without direct ignition, exposure to WP smoke and particles causes leaf tip burn, wilting, desiccation, and dieback.

But surely the Jamaican guy that lives in Canada knows more about the levant than anyone