Japanese beetle
The grub feeds just below the surface, it cuts off and consumes the grass roots. Early symptoms include thinning, yellowing, and wilting, culminating in [...] more disruption to the sward than the grubs themselves. Feeding by grubs on roots of maize, beans, tomatoes, strawberries, nursery seedlings, or other crops [...] increase, the grubs move closer to the surface and resume feeding on plant roots at 2.5 to 5.0 cm depth. Pupation usually occurs after 4-6 weeks of feeding