California's almond orchards are facing an unusual infestation of what?

The correct answer is that California's almond orchards are facing an unusual infestation of Roof Rats. Roof rats are particularly problematic in agricultural settings as they can cause significant damage to crops by feeding on the fruit and nuts, which not only affects yields but may also lead to an increase in pests and diseases as these rodents can carry various pathogens.

In the context of California’s almond industry, the rise in Roof Rat populations indicates a shift in ecological balance that could be attributed to various factors, including urban development encroaching on natural habitats, changes in climate, or fluctuations in pest management practices. While the other options like termites, Japanese beetles, and locusts are known pests within their respective environments, they do not specifically pose the same level of threat to almond orchards as Roof Rats, making them less relevant to the current issues faced by the almond industry in California.