What are the symptoms of root knot nematode infestation?

The symptoms of root knot nematode infestation primarily include wilting during the hottest parts of the day, yellowing leaves, and the presence of root galls. Root knot nematodes cause significant damage to plant roots, which leads to a reduced ability for the plant to take up water and nutrients. This results in wilting, especially in hot conditions when the demand for water is greater. Yellowing leaves, or chlorosis, is also a critical indicator as it reflects nutrient deficiencies stemming from root damage. The formation of root galls, which are swollen areas on the roots, is a characteristic sign of nematode activity, as these galls disrupt normal root function and interfere with the plant's overall health.

In contrast, other symptoms mentioned in the question options do not accurately represent root knot nematode effects. For example, wilting and dry soil can be caused by multiple issues, while discoloration of flowers may relate to different plant stress factors. Additionally, rapid growth and increased yield would not be associated with nematode infestations, as such conditions typically lead to stunted growth and reduced yield due to compromised root systems. Thus, the symptoms mentioned in the correct choice provide a clear understanding of how root knot nematodes