Plant Pathology Commons^™

Bacterial Blight Or Black Spot Of Walnuts, O M. Goss, R. F. Doepel

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

Bacterial blight is the most important disease of walnuts in Western Australia.

In bad seasons it can cause heavy losses in susceptible varieties such as Wilson's Wonder, and in some seedling trees.

Carefully timed sprays greatly reduce the incidence of bacterial blight, and it is also recommended that less susceptible varieties—such as Franquette— should be used for new plantings.

Plant Diseases In Western Australia, S C. Chambers

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

This first supplement contains the diseases recorded on vegetables, cereals, grasses and pasture legumes, in the period between the publication of the revised lists (1), (2) for these hosts, and June 30, 1961

Mosaic Disease Of Cucumbers : A New Resistant Variety, H L. Harvey

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

TESTS with the cucumber variety Ohio MR 200 which was introduced from the U.S.A. (1), have shown it to be almost unaffected by the cucumber mosaic virus. It is a good type and satisfactory yielder and promises to be the answer to the cucumber mosaic problem in Western Australia.

Diseases Recorded On Cereals, Grasses And Pasture Legumes In Western Australia, S C. Chambers

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

This list constitutes a revision of portion of the census published by Came (1925) and supplemented by the same author in 1927.

It also contains records of diseases identified in the period between these earlier publications and December 31, 1959.

The list is divided into two sections, the first dealing with pasture legumes and the second with cereals and grasses.

The sections are arranged alphabetically according to the botanical names of the host plants. In general, the viral, bacterial, fungal and nematodal diseases and physiological disorders are listed in that order.

Black Spot Of Tomatoes, R F. Doepel

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

BLACK SPOT DISEASE IS THE MOST SERIOUS FOLIAGE BLIGHT OF TOMATOES IN THIS STATE. IN SEASONS FAVOURABLE TO ITS DEVELOPMENT SEVERE DEFOLIATION AND FRUIT ROTTING ARE EXPERIENCED.

IN Western Australia, black spot, which is also known as early blight and target spot, is a troublesome disease of long standing. It is caused by the fungus Alternaria solani which also attacks potatoes.

The Fruit Industry In Other Lands. 2. The Netherlands, Frank Melville

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

DURING a week spent in Holland, visits were made to the International Agricultural Centre, Wageningen, the Fruit Research Station, Wilhelminadorp, the Virus Indexing Station, Emmeloord, the Glass House Research Station, Naaldwyk, and the fruit and flower auctions at Naaldwyk and Aalsmeer.

Visits to commercial orchards were limited by time.

Brown Spot Of Passion Fruit, Department Of Agriculture, Western Australia

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

BROWN SPOT caused by the fungus Alternaria passiflorae, is found in plantings throughout Western Australia. Severe outbreaks of the disease have occurred in most districts, including Serpentine, Manjimup, Nannup and Denmark. Although isolated young plantings may remain healthy for two or three years the disease eventually becomes established in the vines.

Powdery Mildew Or Oidium Of Grapes, H L. Harvey

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

POWDERY mildew or oidium, is a disease which is always present to a greater or lesser extent in grapevines in Western Australia.

In seasons favourable for its development it stunts the growth of shoots and leaves and may seriously reduce fruit yields and quality.

Most of our commonly-grown varieties are quite susceptible to the disease, but for the reason that currants are the most extensively grown variety, the overall losses are greatest in this variety.

Downy Mildew Of Onions, R F. Doepel

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

DOWNY mildew of onions, caused by the fungus Peronospora destructor, is widespread in Western Australia.

In market gardens adjacent to Perth where the majority of onions are grown the disease occurs each year in spring and early summer crops and often attains epidemic proportions.

The Fruit Industry In Other Lands. 4. The United States Of America (Continued), Frank Melville

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

COMMERCIAL pear growing was seen only in Washington State where production is in the vicinity of five million bushels or about 12 per cent, of the total fruit production of the State.

Two-thirds of the pears are Bartletts which are used extensively for canning. The other main variety is D'Anjou with lesser quantities of Bosc and Winter Nelis all of which are used for the fresh fruit trade.

In the last six years a serious depletion in tree numbers has occurred due to the inroads of Pear Decline a new disease the cause of which at present is unknown.

Chemical Thinning Of Apples, S E. Hardisty, N. H. Shorter

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

TWO important related problems of apple-growing in this State are biennial bearing and poor fruit size.

Early thinning by chemical means, is providing a valuable and practical means of tackling these problems.

With every prospect of heavy crops in most districts this year, many growers will be interested in the possibility of spray thinning.

Geranium Rust, Department Of Agriculture, Western Australia

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

GERANIUMS are affected by relatively few troublesome diseases. However, in Western Australia, leaf rust of these plants is very common and can become a serious problem, particularly in the more susceptible varieties growing in sheltered positions.

Leaf Scorching, Department Of Agriculture, Western Australia

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

DURING the summer months, leaves of many plants develop browning and scorching which progresses inwards from the leaf margin or downwards from the leaf tip.

The affected parts become dry and brittle and may break away from the remaining green areas.

Ornamental trees, shrubs and other plants, certain orchard trees and in fact a large number of species may be affected.

Two plants which are very susceptible to this type of injury and are rarely seen without it are the Ioquat tree and the butterfly tree (Bauhinia).

Tobacco Seed-Bed Management, A E. Baker

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

A SUCCESSFUL tobacco crop depends initially on an ample supply of well-grown, disease-free seedlings available early in the planting season.

If planting is held up due to a poor supply of seedlings, the resulting crop will not be grown in the most favourable part of the season. Late-grown crops nearly always give low returns.

Seed Storage In Relation To Germination, G R W Meadly

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

WE are often asked how long seed can be stored and remain suitable for sowing.

There is no single answer as the period depends on a number of factors, including the type of seed, its condition at the time of storing and the nature of the storage.

Scald Of Barley, S C. Chambers

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

SCALD is a common disease of barley during late winter-early spring and causes considerable damage to the foliage of many crops.

The fungus Rhynchosporium secalis is responsible for this disease which is very prevalent in all barley growing districts.

Rice Stem Borers At The Kimberley Research Station, L E. Koch

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

STEM boring caterpillars have severely damaged rice crops at the Kimberley Research Station, near Wyndham, and studies have been made on the biology, abundance, and control of these insects.

Lupinosis, H W. Bennetts

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

LUPINOSIS is a disease which has caused severe mortalities in West Australian sheep flocks in recent years, and one which—because of the important role which lupins are playing in light land development—must inevitably continue to be a matter of serious concern.

What's Wrong With That Plant?, Department Of Agriculture, Western Australia

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

EACH year several thousand inquiries are received from people who want to know "What's wrong with that plant?" The plants range from common fruit, vegeable and pasture plants to rare ornamentals.

In most cases, the inquiries can be answered satisfactorily by Departmental officers who specialise in the study of various plant troubles.

Sclerotinia Rot Of Beans, S C. Chambers, M. Hardie

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

INVESTIGATIONS over the past three years suggest trenching is the most important practice for controlling Sclerotinia rot in market gardens.

None of the remaining measures under test gave satisfactory control of the disease, although some reduced its incidence significantly.

Bitter Pit : A Progress Report On The Use Of Calcium Nitrate Sprays For Its Control, Frank Melville, S. E. Hardisty

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

FREEDOM from serious pests and diseases such as Black Spot and Codling Moth and relative immunity from storage rots has greatly simplified apple growing in Western Australia.

However, what has been gained in this respect is often countered by pre-harvest and post-harvest physiological troubles which are rather common to apple growing in this State.

Bacterial Wilt Of Potatoes, Department Of Agriculture, Western Australia

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

EACH season, Bacterial Wilt causes heavy losses to individual growers in several of the potato districts throughout the South-West of the State.

The disease is incited by the bacterium Pseudomonas solanacearum E.F.Sm. and is most prevalent in the districts of Donnvbrook. Pemberton and Manjimup as well as in the area between Waroona and Dardanup.

It is a tuber-borne disease which is extremely difficult to eradicate, once it has been introduced on to a property.

The Fruit Industry In Other Lands. 1. The United Kingdom, Frank Melville

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

THE following report deals with the many aspects of fruit growing both technical and commercial covered during a tour of three overseas countries undertaken on behalf of the Department of Agriculture and the fruitgrowers of Western Australia.

In the course of the three and a half months spent on this work, 13 research establishments were visited and contacts were made with research personnel both within these organisations and elsewhere.

Visits to commercial fruit growing areas were made with extension officers and these included brief visits to packing houses.

Altogether I had discussions with 127 research and extension personnel and industry …

Nitrogen-Fixing Bacteria For The Inoculation Of Leguminous Seeds

Journal of the Department of Agriculture, Western Australia, Series 3

The Plant Pathology Branch of the Department of Agriculture can supply the cultures listed below. Owing to the time taken to prepare the cultures, however, and owing also to the fact that in the busy time of the year there is frequently a tremendous accumulation of orders, farmers are requested to lodge their applications together with the requisite payment at least a fortnight before they wish the culture to be forwarded.

The Testing Of Bacterial Strains Used In The Inoculation Of Legumes, Olga M. Goss

Journal of the Department of Agriculture, Western Australia, Series 3

A part from their value as fodder plants, legumes such as peas, beans, clovers, vetches and lucerne play an important role in increasing soil fertility. Their value in the soil-enriching sphere has been recognised for centuries, but it is only comparatively recently that the reason for it has been fully understood.

Brown Rot And Collar Rot Of Citrus, W P. Cass Smith

Journal of the Department of Agriculture, Western Australia, Series 3

Plant disease

Brown rot is a serious disease of citrus, which fortunately has proved to be readily controllable. It attacks both leaves and fruits causing partial or complete defoliation, and a rather characteristic fruit rot. The disease may also affect the bark of citrus trees in the basal trunk region resulting in "collar rot," or as it is sometimes called, brown rot gummosis. This phase of the disease will be referred to later.

Bulletin 119 - Take-All Of Wheat And Similar Diseases Of Cereals, W. M. Carne, J. G.C. Campbell

Bulletins 1 - 2999

This important disease, known also as Footrot, Blackleg, and Whiteheads, affects wheat principally, but also occurs on barley, rye, and certain grasses. In a very few instances it has been known to attack oats, but this is so rare that oats may be regarded for practical purposes as free from attack. Of the grasses attacked the most important, from a farming point of view in Western Australia, are Bailey Grass (Hordeum murinum), Silver Grass (Festuca bromoides and F. myuros), and the so-called Spear grasses (Bromus spp.). These annual grasses are very common in the wheat belt.

Bulletin 121 - Mildew, Septoria, Leaf Spots And Similar Diseases Of Cereals, W. M. Carne, J. G. C. Campbell

Bulletins 1 - 2999

Mildew attacks all the cereals as well as many grasses. but as in black stem rust the fungus has developed specialised races, one attacking wheat, another barley, another rye and so on, so that the form attacking wheat will not attack oats, etc

Bulletin 122 - Fruit-Fly: Description And Control, L. J. Newman

Bulletins 1 - 2999

IT is a fundamental principle of Economic Entomology that, in order to successfully combat an insect, the life history of that insect must be worked out. A feature common to all insects is a series of stages involving distinct changes of form which succeed each other in a definite order.

An insect like the fruit-fly affords no exception to this universal rule. Beginning with the fly, we have in regular succession—Egg, Larva, Pupa, and finally the fly again. These stages represent what is known as the life cycle of time insect. Each change—such as larva to pupa, pupa to fly—is …

Bulletin No 69 - The Poison Plants Of Western Australia, D. A. Herbert

Bulletins 1 - 2999

Up to the present no publication dealing with the whole of the known i)01S0fl plaits of Western Australia has been written. This Bulletin contains the collected accounts of various authors and correspondents which have been published at different times and contains a large amount of original information gathered both from field experience and from laboratory experiments. The work is not complete. A number of plants from distant districts have not been obtainable or obtainable only in amounts insufficient for exhaustive tests. These plants are comparatively few, however, and in Section 13 of this publication those which are suspected, but against …