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Pepper disease controlPepper disease control
ParmParm RandhawaRandhawa, Ph.D., Ph.D.California Seed & Plant LabCalifornia Seed & Plant Lab
Disease control in greenhouse Depends on
Growing in soilContainers (with potting mix)Hydroponic (Rockwool etc)
FusariumHow is pathogen introduced
Soil (people, tools)Previous crop (debris etc)Airborne ascospores
Fusarium - Control
Avoid salt burn (if rockwool dries)Reduce humidity (slow temp increase at night)Bio-control
Erwinia carotovoraHow pathogen get introduced
Irrigation with untreated water (ponds, rivers)
Handling from people (hands)
Xanthomonascontrol
Buy tested seedResistant varieties (multiple races)Actiguard (induces resistance)Copper / Maneb sprays
Bacterio-phage application can help
Damping off - control
Disease free media (steamed)Sanitation (trays etc)Raised benchesDo not over waterTreated water
2-Fungicide drench can help
(Ridomil + Topsin M)
PhytophthoraWhere it comes from
Seed borne ? Wind blown rains bring spores from other plants (tomato, cucurbits, weeds)Irrigation water (rivers)Soil movement (oospores survive)Fungus gnats
Disease develops in 3-4 days after infection
PhytophthoraManagement
Treat waterDisinfection of nursery containersFungicidesGood drainage (drainage area – Keep weed free)
Lab ID should be done to
select correct fungicide
Southern blight - managementHot weather disease
SanitationAerationSpot application of fungicides (Quadrisetc)
Other fungal / bacterial diseases
BacteriaRalstonia, Pseudomonas syringae
Fungi– Pow mildew, Verticillium, Cercospora,
Stemphyllum, Downy mildew, gray leaf spot
I have assumed that these are less
frequent in greenhouse pepper culture
VirusesCause malformation but do not killMany viruses – same symptom One virus – many symptoms
Symptoms provide a clue but Lab test is needed for Identification
How viruses get introduced
Beet curly topLeaf hopper
Tobacco mosaic, tomato mosaic, pepper mild mottle
Seed
Chino del tomate, Pepper mild tigre, Pepper hausteco, Sinaloa leaf curl
White fly
Tomato spotted wiltThrips
Cucumber mosaic, Potato virus Y, Tobacco Etch, Alfalfa mosaic, Pepper mottle
Aphids
15-Virus PCR test
TSWV, TMV, ToMV, CMV, PMMV, TEV, PVY, AMV, PMV
RNA
Gemini group (CdTV, PHV, SLCV, TPV, SGMV), BCTV
DNA
VirusesTest
Virus control
Screens for insect controlHand wash for tobamo virusesTested seed (for tobamo viruses)No smoking (for TMV)Weed removalStylet oil sprays for aphid borneInsecticides
Pathogen eliminationWeed removalInsect screensPlastic cover on soilIrrigation water treatmentFoot bathEtc
Creating unfavorable environment
Heaters for step heating at nightFans to reduce free moistureFertilizer program for inducing resistanceScouting and treatment to reduce insect /disease pressureBiologicals to slow down disease
Biologicals keep working against pests
Rhapsody, Serenade, Sonata
GSB, PM, DM
Rootshield, Pre-stop, Mycostop
Root fungi
You can send sample to me
Pack goodInclude shipping documents (permit)Use Red /white shipping label (from me)Ship
Ready to ship
Packing
End of Season: Check List
Met with staff and reviewedScouting supplies are ready
Weeds, debris removed
Tools, carts etc disinfected
Foot bath ready
Nursery is treated for fungus gnats
Irrigation lines flushed and disinfected
Trash hole is ready