Root Knot Nematodes. If your tomato plants are stunted, their roots have knots (galls) and the foliage is pale yellow, they are most likely infested with root knot nematodes. The galls caused by the nematodes keep the roots from sending nutrients up to the foliage, which causes the stunting and yellowing.
The time when fall starts is between summer and winter. As with the other seasons, its commencement differs and is based on the hemisphere you are in. Commencement Dates. In astronomical terms the season begins on September 22 up to November 22 in the Northern Hemisphere.
On Monday, Sept. 22, the Earth will have nearly equal amounts of light and darkness, as summer ends and a new fall season begins. Depending where you live, the changing colors of leaves or a sudden briskness in the air may have made it seem like the seasons had already shifted, but the equinox on Monday signals the official start of autumn.