Articles
SUSCEPTIBILITY OF VEGETATIVE TISSUES OF FRUIT AND VEGETABLE HOSTS TO INFECTION BY VARIOUS COLLETOTRICHUM SPECIES
Article number
567_136
Pages
631 – 634
Language
English
Abstract
Colletotrichum species cause many serious diseases of fruits and vegetables worldwide.
Three species, C. acutatum, C. fragariae and C. gloeosporioides, are major pathogens of strawberry causing anthracnose fruit and crown rots.
One disease control strategy is to establish new strawberry fields with clean anthracnose-free plants.
To test the hypothesis that Colletotrichum species may move from host to host, 37 Colletotrichum isolates representing nine species collected from 12 hosts were wound inoculated onto the leaves and stems of strawberry, blueberry, blackberry, muscadine grape, tomato and pepper.
Inoculated plants were incubated at 100% RH and 25C for 48 hr.
Symptoms were rated after 30 days.
The four C. fragaraie isolates were most aggressive causing lesion development at an average of 38% of inoculation sites on all hosts except pepper.
The percentage infection for the other species was C. capsici 25%, C. gloeosporioides 18%, C. acutatum 15%, C. destructivum 11%, C. truncatum 9%, C. coccodes 8%, C. higginsianun6%, and C. orbiculare 5%. More lesions developed on stems than on leaves.
Strawberry was the most susceptible host with 58% of petiole and 14% of leaf inoculations resulting in lesion development.
Pepper was the most resistant host with no symptom development on leaves or stems following inoculation with any isolate.
Lesion development with all 37 isolates on stem tissues for the other hosts was blueberry 34%, muscadine grape 26%, blackberry 19% and tomato 13%. The most aggressive of the 16 C. acutatum isolates originated from tomato and pepper.
These results suggest that primary anthracnose infections in strawberry fields may rarely originate from other diseased fruit or vegetable hosts.
Three species, C. acutatum, C. fragariae and C. gloeosporioides, are major pathogens of strawberry causing anthracnose fruit and crown rots.
One disease control strategy is to establish new strawberry fields with clean anthracnose-free plants.
To test the hypothesis that Colletotrichum species may move from host to host, 37 Colletotrichum isolates representing nine species collected from 12 hosts were wound inoculated onto the leaves and stems of strawberry, blueberry, blackberry, muscadine grape, tomato and pepper.
Inoculated plants were incubated at 100% RH and 25C for 48 hr.
Symptoms were rated after 30 days.
The four C. fragaraie isolates were most aggressive causing lesion development at an average of 38% of inoculation sites on all hosts except pepper.
The percentage infection for the other species was C. capsici 25%, C. gloeosporioides 18%, C. acutatum 15%, C. destructivum 11%, C. truncatum 9%, C. coccodes 8%, C. higginsianun6%, and C. orbiculare 5%. More lesions developed on stems than on leaves.
Strawberry was the most susceptible host with 58% of petiole and 14% of leaf inoculations resulting in lesion development.
Pepper was the most resistant host with no symptom development on leaves or stems following inoculation with any isolate.
Lesion development with all 37 isolates on stem tissues for the other hosts was blueberry 34%, muscadine grape 26%, blackberry 19% and tomato 13%. The most aggressive of the 16 C. acutatum isolates originated from tomato and pepper.
These results suggest that primary anthracnose infections in strawberry fields may rarely originate from other diseased fruit or vegetable hosts.
Publication
Authors
B.J. Smith
Keywords
Anthracnose, strawberry, blueberry, muscadine grape, tomato, pepper
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