Plant Pathology Commons^™

A Study Of Puccinia Graminis And Cronartium Ribicola, Duane W. Hughes

Graduate Student Research Papers

It was the purpose of this study (1) to review the literary history of rusts in the United States and in the Northwest in particular, ( 2) to learn where rusts generally are found geographically, (3) to gain further information regarding the etiology of wheat rust (Puccinia graminis tritici), of white pine blister rust (Cronartium ribicola) and to become enlightened on other rusts, (4) to learn ways of controlling the two rusts, black stem rust of wheat and white pine blister rust, and to gain an appreciation of the economic importance of rust prevention.

Studies And Observations On Potato Powdery Mildew, Brent C. Palmer

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Within the past several years, powdery mildew disease has become an increasingly important problem to potato growers in the northern part of Utah. In some fields, reduction in yield due to powdery mildew has been estimated to be as high as 30 percent (Treshow and Cannon, 1961). The disease has been reported from many parts of the world. Other than in Utah, however, the only place where it has been considered to be of economic importance is Palestine. In that country, reduction in yield has been estimated to be as high as 20 percent (Palti and Moeller, 1946).

Studies On Flagging And Root And Butt Rot Of Subalpine Fir, Abies Lasiocarpa (Hook.) Nutt., David Lavar Nelson

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Subalpine fir, Abies lasiocarpa (Hook.) Nutt., is a common climax dominant of the extensive spruce-fir forests of the subalpine zone of the Rocky Mountains from the southern Yukon Territory to the high mountains of New Mexico and Arizona (Society of American Foresters, 1954).

Infrared Spectroscopy As Applied To The Study Of Biochemical Changes Induced By Tobacco Mosaic Virus In Leaf Cells, Banavara Krishnappa Chandrasekhar

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The biochemical reactions occurring during the early stages in the infection cycle of a plant virus are still unknown. Many studies involving bacteriophage and animal viruses that have been made in recent years have provided evidence of the nature of virus infection, but these have not been of much value in understanding the nature of plant viruses. Infrared spectroscopy applied to the study of viral infection processes by Chochran and his co-workers (1960, 1962) have given some clues about the nature of biochemical changes taking place in the leaf tissues as a result of infection with cucumber mosaic virus and …

Pasmo Of Linseed And Flax, S C. Chambers

Journal of the Department of Agriculture, Western Australia, Series 4

Pasmo is a foliage disease which may cause severe damage to plantings of linseed and flax approaching maturity.

The disease is favoured by warm humid conditions and is especially destructive when crops have lodged extensively as a result of storms.

Rust Of Stone Fruit : Results Of Some Recent Spray Trials, R F. Doepel, S. E. Hardisty

Journal of the Department of Agriculture, Western Australia, Series 4

RUST is caused by the fungus Tranzchelia discolor which attacks almonds, nectarines, peaches and, less commonly, apricots and plums in Western Australia.

Rust disease occurs in stone fruit orchards throughout the State and in some seasons causes premature leaf fall.

In unsprayed canning peach orchards growers have suffered considerable losses as a result of infected fruit being rejected for processing.

In recent spray trials satisfactory control has been achieved with the fungicides Delan, thiram and zineb.

Plant Diseases : Sclerotinia Disease In Vegetables : Control With Allisan Fungicide : A Progress Report, S C. Chambers, M. Hardie

Journal of the Department of Agriculture, Western Australia, Series 4

During the past decade sclerotinia rot has become a major disease problem in metropolitan market gardens.

The fungicide Allisan has given promising results as a cover spray for the control of Sclerotinia. Two applications of the material reduced the incidence of Sclerotinia in runner beans from 45 per cent, to 15 per cent, and in lettuce from 9 per cent, to 2 per cent.

Plant Diseases : Bacterial Gall Of Oleander, G C. Macnish

Journal of the Department of Agriculture, Western Australia, Series 4

OLEANDER is an attractive evergreen shrub which will grow in all but the coldest districts of Western Australia.

Unfortunately it is affected by a bacterial disease which causes unsightly malformation or galling of all above ground parts.

The organism causing this disease is the bacterium Pseudomonas tonelliana Ferraris.

Black Leg Of Cabbage And Related Plants, G C. Macnish

Journal of the Department of Agriculture, Western Australia, Series 4

BLACK LEG is a disease which attacks many kinds of cruciferous plants.Under certain conditions it can cause serious damage.

In Western Australia it has been recorded on cabbages, cauliflowers and kales.

The dry rot form damages swedes.

Crinkle Of Plums And Wind-Suck Of Grapes, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

No abstract provided.

Bactericidal Sprays For Tomato Bacterial Canker, O M. Goss

Journal of the Department of Agriculture, Western Australia, Series 4

BACTERIAL CANKER of tomatoes causes its greatest damage in crops grown in the spring and autumn months in Western Australia. It is particularly damaging when the weather is unusually stormy and cool.

Bactericidal sprays applied immediately after pruning or after severe storms should reduce the spread of tomato bacterial canker—report of an experiment.

Weeds In Lawns. 2. The Control Of Weeds In Lawns, Geoffrey A. Pearce

Journal of the Department of Agriculture, Western Australia, Series 4

M OST lawns have weeds growing in them at some time during the year and in some lawns weed control becomes a major problem.

To the many people who like to keep a weed free turf it is therefore encouraging to know that nearly all weeds can be controlled with herbicides.

Spraying Guide For Control Of Pests And Diseases Of Fruit Trees, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

THE guide for spraying fruit trees has been prepared as a ready reference for fruit growers and as a reminder of control measures needed to deal with orchard pests and diseases.

The charts have been kept as brief as possible consistent with supplying details of recommended materials, concentrations and time of application.

Growers should consult Department of Agriculture leaflets or departmental officers for more detailed information.

Insect Pests Of Lawns. Part 3, D G. Shedley

Journal of the Department of Agriculture, Western Australia, Series 4

DISTORTION of leaves and stems, general unthriftiness and bleaching of the leaves are typical symptoms of damage by sap sucking insects in lawns.

Recommended Wheat Varieties : 1964, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

THE State Wheat Advisory Committee has issued its official list of recommended wheat varieties for 1964.

Fig Mosaic, H L. Harvey

Journal of the Department of Agriculture, Western Australia, Series 4

While fig production on a commercial scale is very limited in Western Australia, there is a wide distribution of trees grown singly or in small groups in orchards, farms and home gardens.

One disease that is widespread and sometimes causes concern to growers is fig mosaic.

Storage Of Yates Apples In Polythene Lined Boxes, Frank Melville

Journal of the Department of Agriculture, Western Australia, Series 4

Yates apples are subject to shrivelling and must be carefully stored to prevent undue loss of moisture.

Trials conducted in 1955 demonstrated that wilting can be prevented by cold storage in polythene lined boxes and this is now common practice in this State.

Foliage Diseases Of Lucerne, S C. Chambers

Journal of the Department of Agriculture, Western Australia, Series 4

Lucerne is subject to several foliage diseases in Western Australia, the more important being common leaf spot, rust and downy mildew.

These fungal diseases are all favoured by humid conditions and are especially prevalent in lucerne stands growing under irrigation.

Control Of Copper, Zinc And Manganese Deficiencies In Fruit Trees, N J. Halse

Journal of the Department of Agriculture, Western Australia, Series 4

THE three elements copper, zinc and manganese are plant nutrients of the type often referred to as minor or trace elements.

Although essential elements for plant growth, they are required in comparatively small quantities.

Powdery Mildew Of Apples : Results Of Recent Spray Trials, R F. Doepel, S. E. Hardisty

Journal of the Department of Agriculture, Western Australia, Series 4

Powdery mildew of apples is found in orchard districts throughout the South-West.

recent years a rapid build-up of the disease has occurred in some plantings as a result of changes in orchard practice.

Satisfactory control can be achieved by pruning out infected shoots and spraying with Karathane or Morocide

Septoria Leaf Blotch Of Oats, S C. Chambers

Journal of the Department of Agriculture, Western Australia, Series 4

SEPTORIA leaf blotch is a relatively common disease of oats in the southern cereal areas of Western Australia.

In some seasons it causes severe lodging.

Diseases Recorded On Native Plants, Weeds, Field And Fibre Crops In Western Australia, G C. Macnish

Journal of the Department of Agriculture, Western Australia, Series 4

This list is divided into three sections, the first dealing with native plants, the second with weeds (except grasses) and third with field and fibre crops.

Take-All Of Wheat On The Esperance Downs, S C. Chambers

Journal of the Department of Agriculture, Western Australia, Series 4

THE agricultural development of the Esperance Downs was reviewed recently by Shier, Dunne and Fitzpatrick (1963) who indicated the great potential of this region.

They described the establishment of clover ley pastures capable of supporting heavy stocking rates. Crops of oats or linseed also give excellent returns.

Weed-free rotations which include linseed, oats or vetches may reduce wheat losses caused by take-all on the Esperance Downs.

Hibiscus Collar Rot, G C. Macnish

Journal of the Department of Agriculture, Western Australia, Series 4

FLOWERING hibiscus have been one of the most popular ornamentals in the home garden for several years.

However since about 1959, many home gardeners have been disappointed to see their hibiscus attacked and destroyed by a collar rot.

This disease, which is new in Western Australia, has been most destructive on the popular Apple Blossom variety.

Plant Diseases : Pear Scab : Control By Fungicidal Sprays, R F. Doepel, S. E. Hardisty

Journal of the Department of Agriculture, Western Australia, Series 4

Scab is an important fungal disease of pears in Western Australia.

Serious fruit losses occur in orchards where spraying is neglected, poorly timed or inefficiently carried out.

A full spray schedule, using a proven fungicide, must be adopted from spur burst onwards to ensure protection of fruit and foliage.

Iron Deficiency Of Oats In The Lower South West, Edgar Noel Fitzpatrick, R. Sprivulis

Journal of the Department of Agriculture, Western Australia, Series 4

Oats grown on the acid peaty sands of the West and South Coastal areas of Western Australia develop iron deficiency.

This deficiency can be cured by spraying with iron sulphate. A 2 to 4 per cent, solution can be applied through a low volume spray without damage to the plants. The spray should be repeated when deficiency symptoms reappear.

Growing oats on these soils is not recommended.

Gum Spots On Citrus Leaves, Department Of Agriculture, Western Australia

Journal of the Department of Agriculture, Western Australia, Series 4

GUM SPOTS on citrus leaves are one of many types of leaf spots which prompt numerous enquiries from citrus growers.

Although they are fairly characteristic in appearance they are often confused with spots due to other causes, such as fungi, spray chemicals and so on.