Can systemic chemicals be applied less frequently than protective chemicals?

Systemic chemicals can indeed be applied less frequently than protective chemicals, and this is largely because of the way they function in a plant or pest management context. Systemic pesticides are absorbed by the plant and distributed throughout its tissues, providing long-lasting protection against pests that feed on the plant. Since these chemicals remain effective within the plant for an extended period, fewer applications are necessary compared to protective chemicals, which often form a barrier on the surface and require regular reapplication to maintain efficacy due to weathering, washing away, or degradation.

This longer-lasting action of systemic chemicals allows for a more infrequent application schedule, which can be a more efficient approach in pest management practices. Additionally, this characteristic can reduce labor and material costs, providing an overall benefit in integrated pest management strategies.

In contrast, protective chemicals need to be reapplied regularly, especially after rain or heavy dew, as their effectiveness diminishes more quickly. Therefore, option B accurately reflects the application frequency of systemic versus protective chemicals.