In the United States, US Postal Stamps are rated in 0.01 cent and up; the postage for a first class letter is 0.44 cents (of normal size and weight).
Trematodes are flattened oval or worm-like animals, usually no more than a few centimetres in length, although species as small as 1 millimetre (0.039 in) (Monogenea) and as large as 7 centimetres (2.8 in) (Fasciolopsis) are known. species that exemplifies the remarkable life history of the trematodes is the bird fluke, Leucochloridium paradoxum. The definitive hosts, in which the parasite reproduces, are various woodland birds, while the hosts in which the parasite multiplies (intermediate host) are various species of snail.
A few nematodes, such as the root-knot nematode and the root-lesion nematode, attack many kinds of crops. Damage from nematodes includes stunting, chlorosis, and root distortion. Enough bad news; letâs focus on beneficial nematodes, how they work, and how to best use them.he nematodes commonly used as biological control agents for soil pests belong to the families Steinernematidae and Heterorhabditidae. Some commercially available nematode species are: Steinernema carpocapsae, S. feltiae, S. riobrave, Heterorhabditis bacteriophora, H. marelatus, and H. megidis.