Control of maize rust

This type is often referred to as partial resistance but has also been called general slow-rusting and rate-reducing resistance. The influence of temperature and light on rust reaction of inbred.

Select only diseased-free seeds for planting.

Control of maize rust. Maize rusts are generally controlled by the use of resistant maize hybrids and by foliar applications of fungicides on sweet corn. Cultural practices may be effective in areas where rust spores can overwinter on debris or where. CULTURAL CONTROL Cultural control is important.

The following should be done. Do not plant maize next to plots that already have rust disease. The rust can be seed borne but the spores survive for only 2 months so infection from seeds is not usually a risk.

Plant maize during the drier times of the year. Apply a foliar fungicide early in the season if rust is bound to spread rapidly due to the weather conditions. Numerous fungicides are available for rust control.

Products containing mancozeb pyraclostrobin pyraclostrobin metconazole pyraclostrobin fluxapyroxad azoxystrobin propiconazole trifloxystrobin prothioconazole can be used to control the disease. Control of rusts and powdery mildews by a new systemic fungicide Bayleton. A note on efficacy of some fungicides to common rust Puccinia sorghi of maize Zea mays L.

Himachal Journal of Agricultural Research 171-289-90. The influence of temperature and light on rust reaction of inbred. The disease is common in humid hot climate especially when maize is repeatedly planted after maize.

Control is by well-planned crop rotation and the use of resistant varieties. The use of resistant maize hybrids is the most feasible means of controlling Polysora rust. Planting early can avoid periods of heavy disease pressure later in the season.

Chemical control In the absence of host resistance fungicides can be used to control Polysora rust in seasons where disease severity is expected to be high. Fungicides should be applied seven weeks following planting. Have age-related resistance to the rust fungi and plant-ing corn as early as possible can minimize disease risk later in the season because leaves will typically be more mature and less susceptible to infection when rust spores arrive from the South.

Fungicides are available for in-season rust. DURING 1953 we have studied resistance in maize to the form of the rust fungus Puccinia polysora Underw that recently appeared in East Africa 1. On the other hand common rust is endemic in the maize production area of Argentina 6 7.

This disease occurs each year with varying degrees of intensity according to the behaviour of the hybrid and the prevailing environmental conditions 8. Disease control usually consists of using resistant cultivars and chemical con-. Control Measures for Downy Mildew Diseases The eradication of collateral and wild hosts near maize field and rouging infected maize plants has been recommended.

Destruction of plant debris by deep ploughing and other methods. Seed treatment with Metalaxyl at 4 gkg and foliar spray of Mancozeb 25 gl or Metalaxyl MZ at 2gl is recommended. Management Strategies The use of resistant hybrids is the primary management strategy for the control of common rust.

Timely planting of corn early during the growing season may help to avoid high inoculum levels or environmental conditions that would promote disease development. This rust fungus appears in maize crops during summer but the time of the initial appearance has not been consistent over the years. Although the initial appearance is usually in early June in 1974 it did not appear until mid-August.

Several hypotheses can be put forward to explain the appearance of rust diseases in cereals viz. A Overwintering in the form of uredomycelium. This is a.

Host resistance is probably the most feasible means of controlling P. Sorghi in many situations. Two general types of resistance to P.

Sorghi are available in maize. One type involves a quantitative reduction in the numbers of uredinia. This type is often referred to as partial resistance but has also been called general slow-rusting and rate-reducing resistance.

The second type of resistance results in a. Southern corn rust Puccinia polysora Underw has caused losses in lateplanted maize Zea mays L in the southern United States in 1972 1973 and 1974Two susceptible resistant crosses to this rust were made and the parents F 1 F 2 and BC 1 populations were studied in the greenhouse for their response to this rust. A single dominant gene for resistance to corn rust was found in a.

AMISTAR TOP 325SC Fungicide for the control of Grey Leaf Spot Leaf Blight and Common Rust in Maize. Rust Angular leafspot and Anthracnose in French beans. Ascochyta leafspot and powdery mildew on snow peas and Powdery Mildew in Roses.

Systemic and contact mode of action. Broad spectrum control of diseases on leaves and fruits. Maize sterile stunt virus strains of barley yellow striate virus Maize streak.

Maize streak virus MSV Maize stripe maize chlorotic stripe maize hoja blanca Maize stripe virus. Maize tassel abortion Maize tassel abortion virus MTAV Maize vein enation Maize vein enation virus MVEV Maize wallaby ear Maize wallaby ear virus MWEV Maize white leaf. Select only diseased-free seeds for planting.

If there was a heavy infestation of rust on your farm during the previous crop practice crop rotation by planting a different crop in the next cropping season. Control weeds to facilitate air circulation and rapid drying of the plants canopy. Prune coffee plants properly.

Pruning improves air circulation and promotes rapid drying of the foliage. Maize rusts The three leaf rusts on maize are common rust polysora rust and tropical rust. Common rust Puccinia sorghi The disease is found worldwide in subtropical temperate and highland environments with high humidity.

Common rust is most conspicuous when plants approach tasseling. It may be recognized by small.