Basil Downy Mildew Monitoring Records 2014
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Have been spraying Serenade, Organic Garden Fungicide no effective results on infected plants. Will try a new batch with spraying before infection occurs. Wet weather in spring and early summer. Lemon seems least affected, Purple harder to diagnose.
100% loss, all plants were destroyed, suspect the disease came in on seed.
I am an organic farmer and I hope planting with minor density is the key to avoid peronospora
Sent to UMass by CA grower
rotation of all reg. chems @2-3 day did not slow infection.  Crpo cleaned to new buds with trash removed from fld; entire crop lost 7/2/2014
The basil plant started showing signs of disease very soon after buying it. It is exposed to full sun where the temperature is usually low 70s for a high and high 50s for a low. There is generally a large amount of dew every morning from the fog. Burlingame is sunny nearly year round, but the fog rolls in nearly every night and rolls out by usually 10am.
Purchased at a nursery in Sawtelle. Weather has been hot and dry with light breezes. It's not that humid/damp here. I never checked under the leaves until today, but I had noticed yellowing ever since I put it in the ground...just assumed it was being pouty about moving locations.
Purchased plants when 3" tall from an organic nursery.
lettuce leaf basil' was affected whereas 'genovese basil' was not affected even though they were planted side by side in the same pot. Update - June 30 - genovese basil now seriously affected as well - entire plant
I grew two varieties of bail and planted in two successions Genovese basil and Nufar for organic commercial production. The 1st succession was hit hard by downy. the 2nd succession lasted a little longer as it was interplanted with eggplant, tomatoes and melons. The disease was on seen on these plants. Row cover worked on test plot and prevented the spores on 600 plants. Some OMRI sprays were applied at first observation that seemed to keep it from spreading. This was the 1st time DM was ever found on our farm.
Seedlings were purchased from local store in early June - were green and healthy. Still ok after transplanting a couple weeks later. Kept in sunny spot. Disease symptoms began showing up after a very rainy, cloudy and cool few days (July 22-25); not typical for this region. Removed all affected leaves - washed thoroughly the least affected leaves to use for cooking since not toxic.  Will see how plants do in sun again and see if plant store can recommend a treatment.
Seedlings were purchased from two local stores and were green and healthy until I transplanted them at different times during the summer. Disease symptoms begin showing up within a week. We are having a very damp, somewhat cool summer compared to what's typical for this region.
Plants were purchased from store in Lakewood
Seedlings with only 2 sets of leaves became speckled and looked sunburned.  Destroyed seedlings and dumped dirt.  Last summer (Jun) CT had a very rainy and humid season, devastated crop (200 plants) reseeded, again seedlings infected, reseeded late July infected.  Sprayed with bakingsoda/dish soap continuously for weeks with no result.  Copper fungicide did not work once the disease had established.  Obviously mold over winters in soil even after a very harsh winter. Have seen the same disease in local greenhouses when I went to resupply basil needs.  HELP!
Purchased at big box store garden centers.
Only a small percentage of new leaves appear free of disease on visual inspection. Interestingly, plants have survived all season despite being severely affected by early summer.
I have been overhead watering. I will stop that. we've had much rain. If things dry out, maybe it can be controlled. The Thai basil and Greek basil are not effected.
I've not seen this issue before here. Not sure if it came with the plants? I have other single plants in flower boxes nearby that don't seem affected (yet). Found your site, and from description and pictures sure sounds like exactly what I have...
Cat mint also severely affected with a similar fungal infection this year. Plants were well established (10+ years) and healthy until this year. Have also noticed similar sporing on first-growth leaves of buddleia bushes.
The plants started out beautifully, but then about 3 weeks ago we started noticing yellowing. It thought we might be over-watering. Then yesterday I noticed the black spores on the undersides of the leaves. They plants are a-goner. We're about to pull them ALL out. I would like to know what we should do next year, as I have read in some spots that planting basil in this same location next year may expose them to spores that will be in the soil already from this year.
Purchased seeds from Home Depot. Plants were very healthy then leaves began to grow narrower with sides curling upward. Within a week the sooty substance was found on about 10% of the leaves which were removed. Leaves of all plants were infected 100% within 5 days.
I also tried Swett Thai basil and Greek basil and got similar results.. The plants were atrting to show mold symptomswithin 10 days
I noticed this last year as well, but it was at the end of the season and I just attributed it to something else. I do notice that it gets worse when it rains, and may have initiall appeared after a rain event. I did grow this year's basil in the same pot as last years. I will destroy the pot.
First noticed on individual potted plants last year, end of season, thought nothing other than an isolated instance. only 3 plants infected and all dirt disposed of. Never researched-garden plants survived-no symptoms. This year, 2 sucessful harvests-all garden grown plants. 3rd harvest today revealed yellowing leaves with greyish mildewy substance on the bottoms. Harvests all from the same plants. Most all plants seem to be affected in one way or another. New plant growth seems to be unaffected thus far, with the more mature leaves showing the plight.Even the more sparsly planted basil plants with much better circulation showing the signs of this disease. All plants purchased from local nurseries and Lowes. This mildew appears to be an equal opportunity infector. Overspraying is the primary watering method. I have never seen this to this extent.
raining and extremely humid for the past 3 days
Started from seed from Italy
Purchased at Home Depot in Newark, DE
From large cell pack herb supplier in MD, plans to contact
Only use now to attract pollinators.  Thinking about harvesting for compost and starting over again with controlled observation.
A professor brought he basil plants to me for diagnosis- chlorosis was seen on upper side of leaves and profuse sporulation occurred on bottom side. 
Back garden infected severely, while front garden exhibits no visible symptoms (as of yet).
All were doing very well, on one plant the leaves started looking yellowed. Within one week all the rest of plants were affected. They all declined rapidly.
Total loss of sweet basil (and Genovese). Columnar basil varieties are far less susceptible, but are also infected. Heat and drought stress make the problem worse. No plants were grown from seed. Sweet and Genovese basil were purchased from Lowe's, and I suspect the large suppliers for their plants are spreading this disease.
Plants were doing so well, I had 2 harvests for pesto, I thought the black on the bottom of the leaf was soil that splashed up, but when I was washing the second harvest, it was difficult to remove. Within 2 weeks, all leaves were affected and had to be destroyed. (tops of leaves till looked perfect!)
Used fungicide, wiped and sprayed leaves, removed bad leaves and placed in sun. Will throw away. Worried will affect my scallions/parsley/lettuce (all planted in earth box).
Purchased at Home Depot and a local farmer's market
This was the 3rd crop for the grower since March-April and all became infected. He discarded all previous crops. I've seen the disease every year for at least 4 years in GA in hydroponic and greenhouse production, garden centers, and in landscapes/gardens.
mammoth seems more resistant thant sweet basil so far
planted from seeds kept from last year
I started spraying Actinovate in July, but it was too late for effective control.
Plant looked very healthy and strong and was a very full, large plant in a 6" pot when purchased around the 1st of July from Whole Foods. The label said it was from a local farm. I transplanted it in a 12" pot and placed on patio. It did well for a week or two and then I noticed the leaves were changing. I thought I may have over- watered, as I am a very new gardener, but after searching online and seeing the description and photos of downy mildew, I am certain that's what it is.
started from seed early spring, March, all was fine till some humid wet days, followed by cooling off. My garden basil is very advanced, the pots are just developing.
Started as a little yellowing at the base of one plant. Within 2 weeks had spread to 3 more and all 4 plants had cloudy yellow leaves to the top. Took 3 weeks to diagnose because I thought it was a fertilizing issue in the beginning. Plants bought from home depot. Planted in a community garden area, and several other plots in the garden also have infected basil plants.
The few symptoms seen looked new. Another grower reported having DM last fall during the rainy period. A very few leaves in his planting had yellow sections resembling DM, but no spores were seen even after incubaitng leaves on damp paper towel in plastic bag.
No basil planted since 2011, March 2014 planted 2 sweet basil, plants clean. Thai basil planted 4/24/14. Early May noticed plants at local Walmart <1 mile away being sold with downy mildew symptoms. 2 wks after rain, noticed yellowing between leaf margins and sporulation on 2 Thai basil.
Bought from local Home Depot.
Purchased at either Home Depot in Chicago or local green store in Oak Park, IL. I thought it was cold damage at first and ignored it. Pulled the basil this weekend after realizing what it was. Other plants purchased separately don't seem to be infected yet.
Purchased at Home Depot or other garden center
Purchased at Lowe's
purchased at Home Depot
Thai basil, lemon & lime basil immediately adjacent are less affected. Most were transplanted from various sources but some Genovese from seed. First sign was spores on leaves of a large-leafed, unidentified variety.
Purchased at Lowes early June (couldn't find any basil plants at local nurseries or garden centers). Had same problem 2013 growing season with plants purchased from local garden center.
Unable to determine whether all plants from different sources were affected when purchased or whether mildew was passed from pot to pot due to close proximity. Now suspect that poor health of other plants as early as mid-July may have been this was well.
Field progressed faster than in our high tunnels. We got signiifcant harvests before onset. Combined high tunnel and field harvests from 5/23-7/17 when sporing was evident. Did use Double Nickle 55 in semi-regular spray schedule. Usually before rains. Very wet early summer. 13" of rain from June-July.
We've had a lot of rain here and cooler weather. Also, my garden is probably overplanted (not enough circulation), especially given the wetness. But plants in beds not overplanted were also affected.
Grafted plants of Basil Aristotle type (aka Savour & Longfoot from Hishtil) and tree form Greek Columnar plants (in ground, but within a few feet of the diseased potted plants) have not shown any symptoms to date.
From farmer's market, greenhouse at a community college
plants purchased at Meijer
Grown from seed in my "greenhouse" and transplanted.
By 8/22 planting of 30 plants are close to 90% severity. One atypical large-leaved plant does not appear to have any symptoms.
Grew about 90% from seed (Emily) and 10% got from Lowes. Very wet, humid summer. Unprecedented cool nights and hot (but not super hot) days. Had this problem toward the end of summer last year (mid-September.) Trying to control with fungicide but will have to start! Some not as bad as others.
All affected plants in western end of elevated herb garden. Symptoms appeared after a cool, rainy week. Additional Sweet Basil plants on eastern end of garden starting to show DM symptoms after a day of strong western wind. Containers of Thai and Purple basil in same garden are still healthy. We also grow basil in our vegetable garden, which is downhill and upwind of the container garden. The in-ground plants show no signs of DM and were heavily misted with neem this evening (7/28).
Amethyst Improved' showed first signs, wrote that off as not "improved." Emails from PIDC employees and a write-up in an Extension newsletter caused us to take samples from almost all basil in the garden in mid-September. Confirmed in all of those. Volunteer holy basil not affected, two vegetative types in trials seem ok, but removed out of abundance of caution. Seeds came from different sources. Sweet Italian Large Leaf did not grow in our greenhouse at all with other seedlings and are planted 20+ feet away from in-house grown plants.
I had suspected that the problem came from an area of peony plants that had developed black foliage that was near by.
logging the reports that I have heard from Iowa
Variety trial, only rep 3 of each variety with symptoms
Plants were planted in a raised bed near the University greenhouses in mid June. This is the first time I have seen DM symptoms on these plants.
Going to try zero-tol
Seedlings were grown by local nursery, seeds from Johnny's.
These plants were planted in a container that had 2 previous plants that were removed after they had been harvested to exhaustion. Originall plants that were planted in early Spring were not infected.
I think it came in some infected cinnamon basil seed? But, now it is persistant. Also hearing customer reports of potential incidences in garden plantings with plants not purchased from me. Has caused significant crop loss.
On the date we noticed the problem we harvested the basil for market. The sporulation worsened as the basil was stored in a 50degree walk-in cooler. 1 day after harvest at market basil didn't look great. 2 days after harvest basil at market looked bad. Forced to pull out crop on 6/23. We have yet to see symptoms on later succession plantings (which are planted in different areas of the farm). We have yet to see any indications of Downy Mildew on Thai, Lemon, or Rosie basil.
Purchased at farmer's market
Will be applying serenade. Tomatoes nearby also suffering from possible early blight.
visible spores underneath leaves. leaves turning yellow and black spots. Plants look exactly like pictures on this website
The plant had an abundance of leaves and seemed to be thrieving. I have Basil planted in two different areas about 50 feet apart. One is in the front yard. One is in the back yard. Both plants have mildew.
Grew plants from seed purchased in 2013. No problem with plants grown in 2013 from same seed packet. All current plants seem to be growing well except for yellowing and some spored so may be in early stages?
Cut back infected areas on all plants. Applied micronized sulfur in water to leaves in hopes of rescuing plants and to encourage new leaf production
Have not seen this before in my garden. It has been a wet year. All watering has been done from below. Grown in full sun, good ventilation.
Will remove affected leaves and treat with neem oil
The onset was sudden and severe.
seeds purchased at local nursery. Had it last year for the first time. This year - old gardens are dormant. Started ALL NEW raised beds with fresh compost/square foot garden mixture. I have no idea where it came from this year - 10 plants in 3 gardens and one pot with several plants - all were healthy with huge green leaves - suddenly all became infected. very frustrated. treating with Neem oil - hope it helps. For next year is there a way to assure the seeds are free from this? I have been online shopping for seeds on reputable safe-seed sites and would appreciate any guidance
purchased a few plants at local grocery store in spring; most from seeds. Saw this last year, too, a bit, but didn't know what it was. I thought I had planted too densely or that problem was from rain (we've had enough most of this year) or lack of nutrients. I'd like to see instructions about how to treat or prevent.
Yanked all plants 8/30. Damage was total.
All of my plants were hit despite various sources and some even started from seed. I just bought new plants I am keeping far away in hopes of one last batch of pesto.
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