plankton. n. 1. (Biology) the organisms inhabiting the surface layer of a sea or lake, consisting of small drifting plants and animals, such as diatoms.Compare nekton. [C19: via German from Greek planktos wandering, from plazesthai to roam].lankton is a primary food source for many animals, and consists of bacteria, protozoans, certain algae, cnidarians, tiny crustaceans such as copepods, and many other organisms. Microscopic aquatic organisms that float near the surface of water.
Descriptions of Common Tomato Diseases. 1  Anthracnose - small, circular, slightly sunken spots... 2  Bacterial Canker - wilting, browning plants and bird's-eye fruit spots. 3  Bacterial Spot - small, dark, slightly raised dots on fruit... 4  Bacteria Wilt - entire plant dies rapidly after browning... 5  Blossom End Rot - spot on bottom of fruit turns black and...
Tomato Spotted Wilt Virus of Vegetable Crops. Thrips-vectored Tomato spotted wilt virus (TSWV) is one of the more severe problems affecting tomato and pepper production in the southeastern USA. Losses can range from a few percent to entire fields being abandoned.hrips-vectored Tomato spotted wilt virus (TSWV) is one of the more severe problems affecting tomato and pepper production in the southeastern USA.