Plant Pathology Commons^™

Evaluation Of Post-Harvest Disease Resistance In Blackberry Genotypes, John-Paul Kidd, John R. Clark, Patrick Fenn, Barbara Smith

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

Forty-nine blackberry genotypes (19 cultivars and 30 breeding selections) were evaluated for post-harvest fruit-rot resistance in June and July 2003. Fully mature, undamaged berries were harvested on two dates for each genotype at the University of Arkansas Fruit Substation, Clarksville. After transporting in chilled coolers back to the Plant Pathology Department in Fayetteville, two replications of 10 berries of each genotype were placed in a high-humidity chamber for 3 d (21-23°C; 16-h daylength). This provided a total of four replications for each entry across the two harvest dates. Natural inoculum from the field provided the post-harvest pathogens, and no additional …

Response Of Blackberry Cultivars To Nematode Transmission Of Tobacco Ringspot Virus, Alisha Sanny, John R. Clark, Rose Gergerich

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

A study was conducted on eight cultivars of blackberry (‘Apache’, ‘Arapaho’, ‘Chester’, ‘Chickasaw’, ‘Kiowa’, ‘Navaho’, ‘Shawnee’, and ‘Triple Crown’), of which four plants of each were previously determined in the fall of 2001 to have root, but not leaf, infection with Tobacco ringspot virus (TRSV). The objectives of our study were to determine virus effects on plant vigor and the spread of virus infection in the plants. Eight plants of each cultivar, four infected and four free of infection, were grown in pots on a gravel pad for the 2002 growing season, and samples of primocane and floricane leaves were …

Effects Of Virus Infection On Release Of Volatile Organic Compounds From Insect-Damaged Bean, Phaseolus Vulgaris, Sarah E. Sossamon, Britney K. Jackson, B. Alison Drumwright, Kenneth L. Korth, Gisela F. Erf

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

Insects can serve as important vectors of plant pathogens, especially viruses. Insect feeding on plants causes the systemic release of a wide range of plant volatile compounds that can serve as an indirect plant defense by attracting natural enemies of the herbivorous insect. Previous work suggests that the Mexican bean beetle (Epilachna varivestis) prefers to feed on plants infected by either of two viruses that it is known to transmit: Southern bean mosaic virus (SBMV) or Bean pod mottle virus (BPMV). A possible explanation for the preferred feeding on virus-infected tissues is that the beetles are attracted by volatile signals …

Fertilisers For Wine Grapes : An Information Package To Promote Efficient Fertiliser Practices, B. H. Goldspink, Neil Lantzke, Bob Paulin, Diana Louise Fisher, Colin Gordon, N. Cross, J M. Campbell-Clause

Bulletins 4000 -

No abstract provided.

Virus Disease Of Small Fruits, R. H. Converse

School of Biological Sciences: Faculty Publications

This illustrated handbook was compiled by international authorities on virus and viruslike diseases of small fruits. Crops covered are in the plant genera Fragaria (strawberry), Vaccinium (blueberry and cranberry), Ribes (currant and gooseberry), and Rubus (blackberry and raspberry). The history, geographic distribution, importance, symptoms, transmission, cause, detection, and control of virus and viruslike diseases attacking these crops are discussed.

The Potential For Avocados In Western Australia, Michael Gregory Hawson

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

"The flesh of the ripe fruit is ivory yellow, framed in a surround of exquisite green"

There is only one fruit to which this comment can apply and that is the avocado.

While now regarded as a luxury, avocados have met ready demand on major markets indicating that limited expansion of avocado growing in Victoria, South Australia and Western Australiacouldmprovide quite profitable returns.

Pit And Scald Of Granny Smiths, Department Of Agriculture, Western Australia

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

Trials investigating storage and shipping disorders of fruit, mainly apples and pears, are conducted annually in cool rooms made available to the Department by the W.A. Meat Export Works.

Brown Collar Rot Of Citrus, Department Of Agriculture, Western Australia

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

Infection of fruit and foliage by brown rot fungi (Phytophthora spp.) occurs after opening rains in autumn. It can continue during periods of wet weather until spring.

Powdery Mildew Of Apples, Department Of Agriculture, Western Australia

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

Powdery mildew (Podosphaera leucotricha) markedly affects the growth and vigour of susceptible apple varieties, particularly Jonathan and Cleopatra.

The fungus survives the winter as mycelial threads in dormant buds on spurs and laterals infected the previous season. At bud-burst the mycelium grows onto the developing leaves and blossom clusters to form white patches.

Spores produced on these patches are spread by the wind onto the healthy growth.

Shothole Of Stone Fruit, Department Of Agriculture, Western Australia

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

Shothole disease is most damaging on almonds and early-flowering peaches and apricots but can also affect nectarines, plums and cherries.

The causal fungus IStigmina carpophila) survives the summer in infected buds and twig cankers.

The autumn rains then stimulate production of spores which infect other twigs, buds and subsequently the new spring growth.

Better Rootstocks For Apple Trees, Frank Melville, J. E. L. Cripps

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

Mailing Merton rootstocks have given the best results in ten years' trials with apple rootstocks on Stoneville Research Station and on growers' properties.

THE type of rootstock used imparts important characteristics to an apple tree. Tree size and stability, cropping characteristics, susceptibility to soil-borne pests and diseases and, to some extent, fruit quality are all affected by the choice of rootstock.

Citrus Rootstocks : An Evaluation For New And Replant Areas, Department Of Agriculture, Western Australia

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

Widespread decline of citrus orchards in Western Australia associated with Phytophthora root rot, citrus eelworm and other factors has prompted investigation of various citrus rootstocks.

Trifoliata and Troyer citrange are most suitable for replant areas.

Wider use of these and of other stocks such as sweet orange is advocated for new plantings.

Root Growth Of Apple Trees, J E L Cripps

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

IT will surprise even experienced growers to know that an apple tree in W.A. needs twice the quantity of roots the same tree would need in a more temperate climate such as England's.

Citrus Water Spot, H L. Harvey

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

WATER SPOT is a disease condition which reduces the quality of citrus fruit in Western Australian orchards during continuous wet winter weather.

The problem is greatest in the Hills districts on navel oranges but mandarins may also be affected. Valencia oranges are rarely if ever affected.

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.

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.

Internal Decline Of Lemons, O M. Goss

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

LEMONS maturing on the trees during summer sometimes become affected with the condition known as internal decline.

Citrus Psorosis, H L. Harvey

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

CAREFUL selection of propogating material will prevent the spread of citrus psorosis, a disease which reduces the yield and economic life of infected trees.

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.

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.

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.

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 …

Spraying Tree Fruits, C. C. Wiggans, E. H. Hoppert

Nebraska Agricultural Experiment Station: Historical Circulars

The production of sound, clean fruit is unquestionably one of the major problems facing the modern fruit grower. Culture may be neglected and pruning delayed for a time but the omission of sprays for even a single season demonstrates their absolute necessity. This applies equally to the commercial grower and to the farmer or gardener who has only a few trees.

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 …

Spraying Experiments In Nebraska, J. Ralph Cooper

Nebraska Agricultural Experiment Station: Historical Research Bulletins

The more important questions which were considered during the three years covered by the present report were as follows: 1. How many summer sprays are required and when should they be applied? 2. What is the difference in efficiency between various brands of arsenate of lead? 3. What are the relative values of lime sulphur and Bordeaux as fungicides for spraying apples? 4. Is it possible to lessen or prevent Bordeaux injury and at the same time control fungous diseases? 5. Is it possible to interchange Bordeaux and lime sulphur in a spray schedule in such a manner as to …