Which of the following could be a disadvantage of using organic pesticides?

The choice indicating potential for higher costs over time highlights a notable concern when using organic pesticides. Organic pesticides can sometimes be more expensive to produce and purchase compared to their synthetic counterparts. Additionally, they may require more frequent applications, which can further increase the overall cost. This economic aspect is particularly relevant for farmers and growers who need to maintain profitability while managing pest populations effectively.

In contrast, effectiveness is not universally lower and can vary depending on the situation and pest involved, so it's not accurate to say organic pesticides are less effective in all scenarios. Regulatory approval can vary, but it's not inherently limited compared to synthetic options; many organic pesticides have established pathways for approval. Finally, the notion that organic pesticides are guaranteed compatible with all crops is misleading; the compatibility can vary, just as with any pesticide, and careful assessment of each product's label is necessary to understand its suitability for particular crops.