Which of the following could contribute to phytotoxicity problems when spraying a pesticide on plants?

Temperature and humidity at the time of application are critical environmental factors that can significantly impact the effectiveness of pesticides and the potential for phytotoxicity, which is the toxicity that can cause damage to plant tissues. When temperatures are too high, pesticides can evaporate quickly, potentially leading to a higher concentration of the chemical on the plant surface than intended. This concentration can increase the likelihood of damage to sensitive plants. Conversely, if the humidity is too low, it can cause the pesticide to dry too quickly, leading to uneven coverage and higher concentrations of the active ingredients in certain areas, also increasing the risk of phytotoxicity.

Understanding the interplay of temperature and humidity can help applicators determine the optimal conditions for applying pesticides to minimize the risk of harming the plants. This awareness is crucial for effective pest management while ensuring that plants are not negatively affected by the chemicals being used.