How to identify pests and diseases?
Symptoms: diseases make plants do “funny” things: wilt even if they are well watered, develop sooty black spots or a white fungus, or grow distorted leaves. plant diseases tend to affect the whole plant, while insect pests attack individual fruit or leaves. Plant pathogenic bacteria cause many different kinds of symptoms that include galls and overgrowths, wilts, leaf spots, specks and blights, soft rots, as well as scabs and cankers.COMMON SYMPTOMS OF PLANT DISEASE: Leaf spot: dead, discolored, or injured areas of tissue that usually have distinct margins; spots often appear on leaves or fruit. Blight: rapid yellowing, browning, collapse, and death of leaves, shoots, stems, flowers, or the entire plant.A symptom is a change in plant growth or appearance that may indicate or describe a plant health problem. Examples of symptoms include yellowing, wilting, dieback, galls or blight.
What are the 4 causes of disease?
Infectious diseases are illnesses that happen when tiny living beings get inside the body and multiply. Bacteria, viruses, fungi and parasites are examples of organisms that can cause illness. Many organisms live in and on our bodies. Bacterial diseases vary in severity. Some cause mild, self-limiting illnesses like minor skin infections or mild food poisoning, while others (e. Early diagnosis and treatment greatly improve outcomes.
What are the 12 diseases?
Specifically, the chapters are devoted to the study of cholera, smallpox, bubonic plaque, syphilis, tuberculosis, malaria, fever, influenza, and AIDS. To do this, you’ll be researching one disease of your choosing that falls into one of the six categories listed in the lesson, acute, chronic, primary, secondary, local, or systemic.
What are the three causes of plant disease?
These three are the virulent pathogen (one that can cause disease), a susceptible host (plant) and suitable environmental conditions. Fungi is the most common cause of all plant diseases. That’s because the majority of pathogens are found in the fungal category. Fungi also spread quickly through natural openings, so any trauma caused to the plant might lead to fungal disease.There are more than 80,000 plant diseases known worldwide. In fact, all plants are vulnerable to attack by disease. Crop plants are frequent victims, and crop diseases can result in enormous agricultural and economic losses.There are several types of organisms that cause plant diseases. These include fungi, bacteria, viruses, nematodes, mycoplasmas and spiroplasmas.Infectious plant diseases are mainly caused by pathogenic organisms such as fungi, bacteria, viruses, protozoa, as well as insects and parasitic plants [1]. With the development of agriculture, infectious plant diseases have become an increasingly significant factor affecting crop yield and economic efficiency.Transmission and infection Bacterial pathogens enter plants through wounds, principally produced by adverse weather conditions, humans, tools and machinery, insects, and nematodes, or through natural openings such as stomata, lenticels, hydathodes, nectar-producing glands, and leaf scars.