Plant pathogens and diseases

conditions. False brome is likely to appear in areas post disturbance—like after flooding, in recently excavated land, or on clear cut sites. The grass can create huge, dense, matted patches that can outcompete native understory growth and even tree seedlings. These traits make this grass a primary concern in conservation and industrial efforts. False brome destroys understory diversity, can suffocate young tree seedlings in timberlands, and is inedible to livestock—its growth in Oregon can be detrimental in many facets. The weed’s primary seed dispersal method is through mechanical disturbance (i.e. physically knocking off seeds), thus areas with False Brome growth often require quarantine and management efforts must only occur when the plant is outside of its seed dispersal season. (3) Oak Creek is a watershed that originates in the foothills of the McDonald Forest (northwest of Corvallis) and flows approximately eight miles from its origin to the site of its tributary at Mary’s river. This area was chosen as the location for this study due to its proximity to the city of Corvallis—consequently experiencing higher rates of human disturbance; proximity to land zoned for agricultural or livestock purposes; and due to the history of studies and management of False Brome in the area by Oregon State University. (4) Figure 2: Oak Creek Watershed (5) Methods False Brome has been known to occupy areas of the Oak Creek watershed—presence of False Brome in this area could disrupt…

In any plant or crop you are going to have to deal with the common diseases and insects that go along with it. A few common diseases of corn are: Stewart’s Bacterial Wilt, Root Rot, Corn Smut, and Southern Corn Leaf Blight. Stewart's Bacterial Wilt is a disease that affects corn at any stage of the growing period. Although, this particular wilt is most harmful when sweet corn is at a very young stage. This disease causes wilting and dwarfing of the plants and the plant will most likely never…

BIOLOGYOF TARO LEAF BLIGHT (Phytophthora colocasiae Racib) - A REVIEW ABSTRACT Taro is a tropical tuber crop highly valued in developing countries. It is mostly susceptible to Phytophthora colocasiae, a leaf blight disease (TLB) causing a 25%-50% loss in yield. The pathogen results not only in reduction in vigor, quality and yield but also constitute a barrier to international exchange of germplasm. The warm, humid days, cool and wet nights of the tropics are ideal for reproduction and…

I was in Corn Group A for our posters we presented before Fall break. The two disease topics we covered in corn was Goss’s Wilt and Root Rot Pythium. Impact: Between Goss’s Wilt and Root Rot Pythium I believe the Root Rot Pythium has a much greater impact on a Corn plant. There is a much greater impact because the time of infection is at a much earlier time when the plant is just a seedling and has a slim chance of fighting off the necrotrophic disease. When Pythium attacks the seeding through…

production affects severely it's local and export impact, because it is considered a very important consumption crop with high nutritional value and a potential export crop for the Egyptian farmers. In Egypt about 20% of total area devoted for vegetable production is cultivated with potato. The cultivated area of potato reached 381379 feddan which produce 4,265,178 ton of tubers with an average yield of 11.184 ton/feddan (Anon. 2013). Bacterial wilt is a serious economic disease cause problem…

2012). Similar to other plants grapes also have to deal with the two major microbial, fungi and bacteria. These microorganisms play a major role in grape's ecology. Fungi and bacteria can help grape plants however, it can be pathogenic and can cause diseases. Grapes can be attacked…

wide host range and observed on cereals, barley, rice, rye, wheat etc. and many non-cereal grasses across the world (Jones 1983). Forty-five plant genera that include Asteraceae, Brassicaceae, Lineace and Solanaceae were reported to be prone to this pathogen including Poae, Asteraceae, Brassicaceae, Linaceae and Solanaceae (Harding 1979 ). 1.3.2.3. Symptoms of common root rot (CRR) Because of the difficulty to diagnose the disease as the above ground symptoms were not that obvious, this was…

The fungi Alternaria is a phyto-pathogen cause leaf blight disease to variety of plants. Alternaria alternata and Alternaria helianthi was isolated from Dalbergia sissoo L. and Helianthus annuus L. respectively. Test antagonists grow faster than the pathogen and produced inhibition zones thereby limiting the growth of the pathogen. These antagonistic interactions influence the incidence and severity of the disease caused by the pathogen. When the two Alternaria spp. were tested by dual culture…

Peanut, (Arachis hypogaea L.) is an herbaceous annual plant of the family Fabaceae grown for its oil and edible nuts. Peanut plants are small, usually erect, thin stemmed with feather-like leaves. The leaves are arranged in alternate pairs with leaf-like attachments near the stalk. The peanut plant produces yellow, orange, cream or white flowers which produce 'pegs', characteristic floral structures which sink into the ground to grow the pod. The pods could be reaching up to 10 cm (4 in) in…

1.2 Fungal Plant Pathogens For centuries, Canadian farmers have lost their crops to disease caused by fungal plant pathogens. In agriculture, crop contamination is detected in both pre- and postharvest stages of growth (Bonaterra et al., 2003). During preharvest field preparation, the objective is for farmers to mitigate the negative impacts on biodiversity, improve forest production and minimize impacts on the residual forest stand, soil and water values (Chung et al., 2008). The current use…