Black rot on grapes, please help
Comments (8)
tigrikt (Central NJ/6b)
8 years agolast modified: 8 years agosummersrhythm_z6a thanked tigrikt (Central NJ/6b)Related Discussions
Grapes Rotting
Comments (4)Black rot. The controls must be correctly timed. Two sprays of mancozeb (new growth and pre-bloom) followed by two sprays of myclobutinal (post-bloom and pea sized). The first (new growth) spray is not as important as the next three, which are absolutely critical. But if you can get the first spray in, it would help. The reason for the program is that while mancozeb will completely control black rot by itself, it can only be applied up to 66 days before harvesting, Depending on the variety, you may be bumping up against that limit by the time of those third or fourth sprays. Hence the switchover. This post was edited by nickl on Tue, Jul 30, 13 at 0:30...See MoreGrape Rot Nightmare
Comments (5)You only need to spray once in my experience to control bunch rot or whatever rot we tend to get here on grapes in the northeast (not an important crop to me although managing them is a small part of my job). I don't think it will work for tomatoes- chlorathalinal is the stuff for them although it is considered a more dangerous compound. Montery Fungus Fighter is better than myclobutanil for brown rot on peaches- I forget the actual name of the compound that's in it- same stuff as Orbit. Chlorathalinal is good for peach scab. For peaches I'd recommend a chlor spray about 6 weeks before expected harvest and then MFF 2 weeks later if the label lets you use chlor that close to harvest....See MoreBlack Rot solutions
Comments (8)It's quite humid here. Maybe not so much as - say - Iowa, NYC, or Florida but it's been kinda humid in the mornings - misty. On the other hand it mightnotbe black rot but that is sure what it looks like from looking through pix of grape diseases. Thanks you guys and thanks for the link to the info on the disease. I didn't know about it at the time of blossom set so I didn't spray until it became apparanteafter friotset. The fruit looks ok. -ellie...See MoreRoot rot?? Help please!
Comments (3)If rot, stem is usually quite soft. I can't tell from pic if yes or no. If stems are rotting, plants are usually beheaded. One of the plants in pic 2 is etiolating; but maybe even top right plant is starting to (again, just looking at the photo). I keep succulents in lots of sun, but let rootless ones to establish before putting into good sun. BTW, I am surprised that you consider 20*C 'fairly warm' - I am also in Canada, in colder zone than yours, and temps have been lately in thirties...right now is 32*C (still raising); yesterday high was 35*C, same past few days. Rest of the week is expected same. And humidex values are in very high 30-ties and up to 45*C... I would consider 20*C more than comfortable; and if plants have started to grow roots, keep them in at least morning sun....See Moresummersrhythm_z6a
8 years agolast modified: 8 years agoThank you both for the info! I have never sprayed grapes before, this is new to me. I have 3 seedless grape vines climb on a big gazebo (photo1), and 1 seeded grape vine climb on a small gagezo(photo2), I can't reach a lot of the grapes on the big gazebo roof (15-16' tall), birds eat most of the seedless grapes on top, I shared seedless grapes which I could reach and seeded ones (birds won't eat those) with neighbors and their grandkids every year until last year the black rot showed up. The seeded grape vine has less damage than the seedless ones for some reason. I will spray all of them in the spring. The only way I can collect mummies is to cut the vines down. I am thinking about planting rambler roses to cover the top and keep the grapes within reach up to 8' tall. If I cut down the vines to the ground this fall, will I get any grapes next year? Thanks
I just read the Smal Fruits and Grape Spray Guide, it listed sulfur for black rod. I have 40lb sulfur, I use sulfur mix with dish soap for Powdery Mildew and black spots on roses! :-) Have anyone tried with sulfur spray for black rot?
summersrhythm_z6a
8 years agoThanks tigrikt. Where do I buy Copper spray? Should I cut all the vines down to the ground? I am by Great Lakes in NY. I might had some black rot before, just noticed a lot of more last year and this year, I thought we had too much rain..... I added another garden shed near the big gazebo..... so it might blocked some wind, but the top roof is air flow free, I noticed there is less damage on top, more block rot on the lower side facing east. Still don't know why I got black rot on the small gazebo though, it's in the open, there is nothing blocking the air flow
The grapes on top of the roof look good.....
tigrikt (Central NJ/6b)
8 years agosummersrhythm_z6a
8 years agolast modified: 8 years ago
jtburton