scholarly journals Inheritance of Resistance to Anthracnose Fruit Rot Caused by Colletotrichum fioriniae in Highbush Blueberry

2022 ◽  
Vol 22 (1) ◽  
pp. 160-169
Author(s):  
Timothy D. Miles ◽  
James F. Hancock
Keyword(s):  
Fruit Rot ◽  
Highbush Blueberry ◽  
Inheritance Of Resistance

scholarly journals Potential Impact of Populations Drift on Botrytis Occurrence and Resistance to Multi- and Single-Site Fungicides in Florida Southern Highbush Blueberry Fields

Plant Disease ◽  
2018 ◽  
Vol 102 (11) ◽  
pp. 2142-2148 ◽  
Author(s):  
A. Amiri ◽  
A. I. Zuniga ◽  
N. A. Peres
Keyword(s):  
Germ Tube ◽  
Gray Mold ◽  
Single Site ◽  
Fruit Rot ◽  
Highbush Blueberry ◽  
Thiophanate Methyl ◽  
Central Florida ◽  
Potential Population ◽  
Potential Impact ◽  
Southern Highbush

Incidence of blossom blight and Botrytis fruit rot (BFR), caused by Botrytis cinerea, on two southern highbush blueberry cultivars was evaluated in several blueberry fields grown in the vicinity (BB-Str(+)) or not (BB-Str(−)) of strawberry fields in central Florida. Blossom blight and BFR incidence were higher in BB-Str(+) fields in 2014 and significantly higher in 2015 compared to BB-Str(−) fields. In total, 613 B. cinerea isolates (i.e., 181 and 432 isolates from BB-Str(−) and BB-Str(+) fields, respectively) were collected. The isolates were evaluated for sensitivity to eight single-site and one multisite fungicides using a spore germination and a germ tube elongation assay. Overall, 5, 15, 24, 28, 54, and 93% of isolates collected from BB-Str(−) were resistant to penthiopyrad, cyprodinil, boscalid, fenhexamid, pyraclostrobin, and thiophanate-methyl, respectively. Respective resistance frequencies in BB-Str(+) isolates were 10, 30, 65, 66, 89, and 99%. Resistance frequencies for all fungicides were always higher in BB-Str(+) fields compared to BB-Str(−) fields. Isolates exhibiting resistance to six or five fungicides simultaneously were predominant (50 to 70%) in blueberry fields regardless if they were grown in the vicinity of strawberry fields or not. Among 308 and 305 B. cinerea isolates tested in 2014 and 2015, 41.8 and 47.1%, respectively, showed reduced sensitivity to the multisite fungicide captan. The lower label rate of captan applied preventively did not control isolates with reduced sensitivity on detached blueberry fruit. These findings suggest a potential population flow between strawberry and blueberry fields that may impact blossom blight and gray mold development in blueberry fields. The relatively lower fungicide input applied to blueberry fields compared with strawberry fields seems to be sufficient to select for resistance and multiple-resistant phenotypes in B. cinerea populations in blueberry.

scholarly journals Alternaria Leaf Spot, Twig Blight, and Fruit Rot of Highbush Blueberry in Argentina

Plant Disease ◽  
2004 ◽  
Vol 88 (12) ◽  
pp. 1383-1383 ◽  
Author(s):  
E. R. Wright ◽  
M. C. Rivera ◽  
J. Esperón ◽  
A. Cheheid ◽  
A. Rodríguez Codazzi
Keyword(s):  
Vaccinium Corymbosum ◽  
Fruit Rot ◽  
Fluorescent Light ◽  
Highbush Blueberry ◽  
Disease Symptoms ◽  
Potted Plants ◽  
Leaf Spots ◽  
Twig Blight ◽  
Polyethylene Bags ◽  
Plastic Trays

Disease symptoms have been observed since October 1997 on highbush blueberry (Vaccinium corymbosum L.) cvs. Georgia Gem, O'Neal, and Sharpblue cultivated in Buenos Aires. Lesions were observed on recently planted, as well as mature plants, in commercial fields. Circular-to-irregular, light brown-to-gray leaf spots with brownish red borders, initially 3 to 7 mm in diameter, enlarged and coalesced. Blight developed on twigs. Reddish circular spots appeared on stems, developing small cankers. Dark sunken lesions were observed on attached ripening berries. During December 2002, postharvest fruit rot was noted. Small pieces of diseased leaves, twigs, stems, and fruits were surface sterilized with 0.2% NaOCl, plated on 2% potato dextrose agar (pH 7), and incubated at 20 ± 3°C. Symptomatic fruits were placed in plastic trays in humid chambers. In all cases, olive mycelium developed after 3 days with septate hyphae and abundant ovoid and obclavate muriformly septate conidia. The isolate obtained from diseased leaves of cv. O'Neal was used to test pathogenicity on micropropagated potted plants of 20-cm height and ripe fruits contained in plastic trays. Both plants and fruits belonged to cv. O'Neal. A suspension of 2 × 105 conidia per ml was sprayed on needle-punctured young stems, fully expanded leaves, and mature fruits. Plants and trays were covered with polyethylene bags and kept at 24 ± 3°C under fluorescent light (12-hr photoperiod). The bags were removed after 72 hr. Symptoms appeared after 3 days on fruits and 8 days on leaves and stems. Controls remained symptomless. The inoculated pathogen was recovered from diseased organs and identified as Alternaria tenuissima (Kunze:Fr.) Wiltshire (1). To our knowledge, this is the first report on the presence of A. tenuissima affecting blueberry crops in Argentina. Reference: (1) E. G. Simmons. Mycotaxon 70:325, 1999.

scholarly journals Postharvest Highbush Blueberry Fruit Antimicrobial Volatile Profiles in Relation to Anthracnose Fruit Rot Resistance

2007 ◽  
Vol 132 (6) ◽  
pp. 859-868 ◽  
Author(s):  
James J. Polashock ◽  
Robert A. Saftner ◽  
Matthew Kramer
Keyword(s):  
Vaccinium Corymbosum ◽  
Fruit Rot ◽  
Colletotrichum Acutatum ◽  
Postharvest Disease ◽  
Highbush Blueberry ◽  
Volatile Emissions ◽  
Wide Range ◽  
Early Ripening ◽  
Volatile Profiles ◽  
Antimicrobial Volatiles

Fruit of highbush blueberry (Vaccinium corymbosum L.) produce antimicrobial volatiles, including trans-2-hexenal, that may confer resistance to anthracnose fruit rot, an important postharvest disease caused by Colletotrichum acutatum J.H. Simmonds. To investigate whether aromatic volatiles in highbush blueberry fruit are associated with postharvest fruit rot resistance, we compared volatiles emitted from whole fruit and extracts from fruit kept in air at 20 °C for 0 to 6 days postharvest from cultivars having a wide range of resistance to anthracnose. Antimicrobial volatiles detected included the aldehydes, trans-2-hexenal and hexanal; the monoterpenes, limonene, linalool, 8-hydroxylinalool, α-terpineol, and terpinyl acetate; and the sesquiterpenes, cadinene, caryophyllene, and α-farnesene. There were significant correlations between some detected volatiles and these differed in whole fruit and extracts. Hexanal (in fruit extracts), trans-2-hexenal, terpinyl acetate, and cadinene emissions increased in most cultivars when fruit were kept in air at 20 °C for various times postharvest. Volatile emissions from whole fruit and extracts varied widely among the cultivars with early ripening cultivars generally showing higher volatile emissions than later ripening cultivars. Although the cultivars tested differed in quantities, and in some cases, the types of volatiles produced, these differences were not related to pedigree (i.e., species composition) nor to known anthracnose resistance ratings. Except for the confounded emissions of terpinyl acetate and cadinene, more than 80% of the variation observed for each volatile was attributable to the cultivar (genetic), year (environmental), and cultivar–by-year interaction. The results suggest that, although antimicrobial aldehydes and terpenes emitted from fully ripe highbush blueberry fruit and extracts might be important flavor and aroma components, they do not significantly contribute to disease resistance against anthracnose fruit rot.

scholarly journals Anthracnose Fruit-rot Resistance in Highbush Blueberry Cultivars

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 768D-768
Author(s):  
Mark K. Ehlenfeldt ◽  
Allan W. Stretch ◽  
Vickie Brewster
Keyword(s):  
Colletotrichum Gloeosporioides ◽  
Vaccinium Corymbosum ◽  
Fruit Rot ◽  
Highbush Blueberry ◽  
High Humidity ◽  
Resistant Cultivars ◽  
Green Fruit ◽  
Wide Range ◽  
Fruit Stage

Thirty-three Vaccinium corymbosum selections and cultivars were artificially inoculated with spores of Colletotrichum gloeosporioides in the green fruit stage. Fruit was harvested when ripe and incubated under high-humidity conditions for 1 week, before evaluation. A wide range of susceptibility to anthracnose fruit-rot was found, ranging from 8% to 85%. Among the most-resistant cultivars were: `Elliott' (8%), `Murphy' (8.3%), `Stanley' (13%), and `Weymouth' (16.9%). Among the most-susceptible cultivars were: `Bluetta' (85%), `Spartan' (82.7%), `June' (69.9%), and `Northblue' (69.5%). Uninoculated checks had a maximum of 6% infection.

scholarly journals Inheritance of Resistance to Anthracnose Caused by Colletotrichum coccodes in Tomato (Lycopersicon esculentum)

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 449C-449
Author(s):  
John R. Stommel ◽  
Kathleen G. Haynes
Keyword(s):  
Lycopersicon Esculentum ◽  
Tomato Fruit ◽  
Fruit Rot ◽  
Colletotrichum Coccodes ◽  
Inheritance Of Resistance ◽  
Breeding Line ◽  
Tomato Cultivar ◽  
Breeding Lines ◽  
Anthracnose Resistance ◽  
Plant Introductions

Anthracnose, caused by Colletotrichum coccodes, is a serious ripe tomato fruit rot disease. Genetic resistance to anthracnose is not available in commercial tomato cultivars, but has been reported in small-fruited Plant Introductions (P.I.), and with lesser intensity in a number of breeding lines. Transfer of high levels of resistance from these breeding lines or P.I.s to elite materials has proven difficult. Inheritance of resistance has been described as complex with at least six loci influencing resistance reactions. Segregating populations originating from a cross between a susceptible tomato breeding line and a large-fruited breeding line (88B147) with resistance derived from Lycopersicon esculentum var. cerasiforme P.I. 272636, were evaluated for anthracnose resistance. Analysis of anthracnose resistance in puncture-inoculated fruit indicated small, but significant, additive genetic effects for resistance. Additional populations were developed from crosses of a susceptible inbred processing tomato cultivar with: 1) the resistant P.I. 272636, 2) an unadapted small-fruited resistant line developed from P.I. 272636, and 3) the large-fruited breeding line 88B147, also with resistance derived from P.I. 272636. Small additive effects identified in large-fruited material, in comparison to the resistant P.I., suggests that resistance loci have been lost during germplasm development. This is consistent with the relatively larger lesions observed in large-fruited lines derived from P.I. 272636. Positive correlations were noted between small fruit size and high levels of anthracnose resistance. Identification of molecular markers linked to resistance genes in the respective populations will be discussed.

Does microclimate under grey hail protection net affect biological and nutritional properties of ‘Duke’ highbush blueberry (Vaccinium corymbosumL.)?

Fruits ◽  
2016 ◽  
Vol 71 (3) ◽  
pp. 161-170 ◽  
Author(s):  
Jasminka Milivojević ◽  
Dragan Radivojević ◽  
Mirjana Ruml ◽  
Milena Dimitrijević ◽  
Jelena Dragišić Maksimović
Keyword(s):  
Highbush Blueberry ◽  
Nutritional Properties ◽  
Net Affect

ANALYSIS OF PLANT FRAGARIA XANANASSA DISEASE DIAGNOSES USING PRODUCTION RULES BASE ON EXPERT SYSTEM

2020 ◽  
Vol 16 (1) ◽  
pp. 25-32
Author(s):  
Basiroh Basiroh ◽  
Wiji Lestari
Keyword(s):  
Expert System ◽  
Early Diagnosis ◽  
General Public ◽  
Insect Pests ◽  
Fruit Rot ◽  
Proper Treatment ◽  
Harvest Time ◽  
Production Rules

Errors that occur in solving problems in strawberry plants (Fragaria Xananassa) such as the presence of leaf patches, fruit rot, perforated leaves, and insect pests can be the cause of not maximum in harvest time. The farmers and the general public who planted strawberry (Fragaria Xananassa) need to know the proper treatment of diseases and pests so that future yields as expected. Therefore, it takes an application as a solution in the delivery of information related to the problems that are often encountered in strawberry plants (Fragaria Xananassa). Methods of production rules can be used to diagnose the disease strawberry (Fragaria Xananassa) based on signs or symptoms that occur in the parts of plants and strawberry, the results of diagnosis using this method are the same as we do Consultation on experts.  The purpose of this study was to determine the early diagnosis of disease in strawberry plants (Fragaria Xananassa) based on signs or symptoms that occur in the plant and fruit parts. The results of the analysis of this study showed that the validation of disease and symptom data in strawberry plants (Fragaria Xananassa) reached 99%, meaning that between the data of symptoms and disease understudy the accuracy was guaranteed with the experts.

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