QAC Category B Landscape Maintenance Practice Exam

As temperatures rise, the risk of phytotoxicity, which refers to the toxic effects that certain substances can have on plant health, tends to increase. This is primarily due to several factors linked to higher temperatures.

Firstly, elevated temperatures can enhance the volatility and absorption rates of certain herbicides and chemical applications, which can lead to unintended damage to non-target plants if applied improperly or if environmental conditions change rapidly. Higher temperatures can also stress plants, making them more susceptible to damage from chemicals.

Moreover, warm conditions may accelerate the breakdown of herbicides, leading to higher concentrations in the soil or foliage, which in turn can increase the potential for phytotoxic effects.

Consequently, understanding the relationship between temperature and phytotoxicity is essential for effective landscape maintenance practices, ensuring that treatments are applied in a manner that considers temperature fluctuations to minimize risks to plant health.