23.24
Unknown
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Minggu, 11 Desember 2011
Rabu, 19 Oktober 2011
Weeds Description
Weeds are plants whose presence is not desirable in agricultural land due to lower results can be achieved by crop production.Technical limitation and plastic weed. Technically, since hooked up with a production process of agricultural crops. The presence of weeds down results by interrupting the production of plant growth through competition. Plastic, since this restriction does not bind to a species of plant. On some level, useful plants can be weeds. Conversely, plants that are usually considered weeds can also be considered non-intrusive. Example, soybeans are grown on the sidelines of monoculture cropping corn can be considered a weed, but in intercropping systems are both the main crop. Nevertheless,...
Kamis, 29 September 2011
Nematoda
How nematode morphology?
• Measuring microscopic (body diameter: 0.01 to 0.05 mm, length: 0.4 to 0.5 mm)
• elongated cylindrical shape
• The body encased by the nematode cuticle is transparent, not segmented, beranulasi fine to coarse.
• body cavity (pseudokoelum) containing a viscous liquid that serves as a hydrostatic skeleton.
• In the liquid there are three main organs, namely digestive, reproductive, and tools excretion.
• hole mouth at the anterior end. What is the nature of the internal anatomy of the nematode?
• The organs of the digestive system of the nematode consists of: the oral cavity with stilet, usofagus, colon, and rectum.
• The reproductive system in both sexes are similar, which is shaped like a tube.
• nematode...
Selasa, 27 September 2011
Plant Disease Symptoms and Signs
Symptoms (Symptom) is indicated by changes in vegetation due tothe presence of disease.The sign is the identification of disease in addition to the reactionof host plant parasites mmisal tubh fruit, mycelium, slime, sporecolor.
SYMPTOMS• Local symptoms are symptoms that are limited to certain areassuch as leaf spot, leaf rust, discoloration and others.• Systemic symptoms are present in the whole body of plants such as wilting, stunted.• Symptoms are subtle because of the influence of certaincircumstances of disease symptoms will disappear or not...
Causes of Pain in Plants
How do pathogens cause the plants to be sick?
1. Weaken the host with the way food is absorbed continuously from the cell to its needs.
2. Stop or disrupt the metabolism of host cells with toxin, enzyme, or a secreted ZPT
3. Inhibit the transport of food, mineral nutrients and water through the carrier network.
4. Consuming content of host cells after contact.
Disease progression?
Plant diseases which existed since time immemorial since emerged plants on earth. There is fossil evidence of leaf spot. Some events cause plant diseases fatal to humans who:
1. Year 1000 in Europe. Famous Holy Fire (Holy Fire) or the fire of St. Anthony
2. In 1844 in the U.S.. Potato late blight by Phytopthora infestans
3. Years...
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