Yield and quality of Cucurbita maxima increase with delayed infection by papaya ringspot virus type W
When four-week-old Cucurbita maxima cv. Queensland Blue plants with 5 to 6 expanded leaves were inoculated mechanically with papaya ringspot virus type W, the average yield per plant was only 3.4 kg. Inoculation five weeks later, when female flowering had commenced, resulted in a yield of 9.5 kg/plant, approximately the same as uninoculated plants (8.9 kg/plant). In a second experiment, plants which were infected early and expressed symptoms as 16-day-old plants yielded 2.3 kg/plant, while plants which were infected about 10 weeks later and expressed symptoms as 86-day-old plants yielded 10.9 kg/plant. As well as reducing yield by 62 to 79 percent, early infection reduced quality by distorting the fruit. The time (T) symptoms were first observed, the node at which a fruit was produced (N) and the severity of symptoms on the fruit (F) were related by F= 0.0097T - 0.118N + 0.0021TN + 8.436. It is suggested that losses could be reduced by delaying infection, by using reflective mulch or by promoting rapid early growth before spread of the virus becomes active or by the use of resistant cultivars
| Main Author: | |
|---|---|
| Format: | biblioteca |
| Published: |
1987
|
| Subjects: | HORTALIZAS, CUCURBITA MAXIMA, CALIDAD, RENDIMIENTO, PERDIDAS, VIRUS DE LA MANCHA ANULAR DE LA PAPAYA, INOCULACION, CALABAZA (CUCURBITA), |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | When four-week-old Cucurbita maxima cv. Queensland Blue plants with 5 to 6 expanded leaves were inoculated mechanically with papaya ringspot virus type W, the average yield per plant was only 3.4 kg. Inoculation five weeks later, when female flowering had commenced, resulted in a yield of 9.5 kg/plant, approximately the same as uninoculated plants (8.9 kg/plant). In a second experiment, plants which were infected early and expressed symptoms as 16-day-old plants yielded 2.3 kg/plant, while plants which were infected about 10 weeks later and expressed symptoms as 86-day-old plants yielded 10.9 kg/plant. As well as reducing yield by 62 to 79 percent, early infection reduced quality by distorting the fruit. The time (T) symptoms were first observed, the node at which a fruit was produced (N) and the severity of symptoms on the fruit (F) were related by F= 0.0097T - 0.118N + 0.0021TN + 8.436. It is suggested that losses could be reduced by delaying infection, by using reflective mulch or by promoting rapid early growth before spread of the virus becomes active or by the use of resistant cultivars |
|---|