ISHS Acta Horticulturae 193: XIII International Symposium on Fruit Tree Virus Diseases
TRANSMISSION OF MYCOPLASMA-LIKE BODIES ASSOCIATED WITH WESTERN-X DISEASE AND PEACH YELLOWS DISEASE BY TWO SPECIES OF ALLYGUS |
| Author: | A.M. Hegab |
| Abstract:
The present paper reports experimental transmission and retention of mycoplasma-like bodies (MLB) associated with western-X disease from infected cherry to celery and from infected celery to healthy ones by Allygus commutatus (F.) and evidence that this species may be most important economic vector of the pathogen in cherry and peach plantations. The author is able to establish that A.commutatus is here reported for the first time as a new vector of MLB associated with western-X disease in cherry orchards. It was shown that A.commutatus acquired the pathogen in the nymphal stage and transmitted it only in the adult stage. It was also shown that the minimum acquisition feeding period was 14 to 21 days (by adults) and 11 to 15 days (by nymphs). The incubation period was 28 to 38 days (by using adults) and 24 to 35 days (by using nymphs). Adults retained their infectivity as long as they were alive (70–80 days). Allygus abbreviatus (Leth.) is a frequent leafhopper in peach orchards in Hungary. It proved to be a new suitable vector for the transmission of mycoplasma like bodies associated with peach yellows disease. Results indicated that A.abbreviatus nymphs were able to acquire the pathogen and transmitted it only in the adult stage. The minimum acquisition perid ranged between 10–15 days (by using nymphs) and 13–18 days (by using adults). The incubation period was 30–40 days for adults and 28–35 days for nymphs. Adults retained infection as long as they were alive. | |
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