At the end of this hand-out, you will find a dicotomic key to the main mineral deficiencies in the tomato plant which will be our model of study for this important topic. Please familiarize yourself with the terms used and ask me or Ms. Sheena Philips if you have any questions. To provide an environment for plants to obtain their essential chemical and physical requirements. Symptoms appearing first or most severly on youngest leaves . . . . . Interveinal chlorosis present on young leaves .
Smallest veins remain green.
In older leaves the necrosis may appear as interveinal brown necrotic spots 2 to 4 mm in diameter located near the main veins . . . . . Black spots do not appear. Smallest veins do not remain green. Necrotic areas, if present, are not associated with any particular part of the lamina . . . . . Young leaves do not show interveinal chlorosis, but young leaflets may show chlorosis toward their central basal portion . . . . .