Technique combats widespread passion fruit disease

phys.org | 8/30/2018 | Staff
townskey13 (Posted by) Level 3
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Passion fruit woodiness caused by cowpea aphid-borne mosaic virus (CABMV), the disease that most affects passion fruit (Passiflora edulis) grown in Brazil, can be treated with a relatively simple technique, according to a study published in the journal Plant Pathology. It shows that systematic eradication of plants with symptoms of the disease preserves the crop as a whole and keeps plants producing for at least 25 months.

The technique currently used to combat CABMV entails renewing the entire orchard every year. This is, of course, a costly procedure. According to the authors of the study, economic factors are critical for this crop, which is mostly grown by small producers.

CABMV - States - Brazil - Plant - Development

CABMV occurs in all states of Brazil and impairs plant development. Passion fruit woodiness disease causes leaf mosaic, blisters, deformation and reduced fruit size, making the produce unmarketable. Vines are typically eliminated only when the disease is detected in the early stages of their life cycle. The researchers propose systematic roguing—removal of weak, diseased or abnormal plants—throughout the life of the crop.

The study was conducted by Brazilian researchers affiliated with the University of São Paulo's Luiz de Queiroz College of Agriculture (ESALQ-USP), the Federal University of São Carlos (UFSCar) at Araras, the University of Southwest Bahia (UESB), and the Semiarid Agriculture Unit of the Brazilian Agricultural Research Corporation (EMBRAPA), as well as colleagues at Argentina's National Agricultural Technology Institute (INTA).

Roguing - Technique - Disease - Espírito - Santo

"Roguing is a technique that has been used to combat papaya disease in Espírito Santo state since the 1980s. After several experiments, it was found to be the best way to control papaya ringspot virus type P [PRSV-P]," said Jorge Alberto Marques Rezende, full professor at ESALQ-USP and principal investigator for the study, which began in 2010.

CABMV is transmitted by aphid saliva and spreads throughout an orchard in a few months. The aphid species...
(Excerpt) Read more at: phys.org
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