Kelly Young Horticulture Agent University of Arizona Cooperative Extension, Maricopa County
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1 Kelly Young Horticulture Agent University of Arizona Cooperative Extension, Maricopa County
2 1. Yes 2. No 50% 50% 1 2
3 1. Determine what is normal for the plant 2. Inquire about irrigation practices 3. Identify the plant 4. Recommend corrective pruning 5. Go to a big-box nursery department and ask for a product recommendation 20% 20% 20% 20% 20%
4 1. Poor pruning 2. Insects 12% 12% 12% 12% 12% 12% 12% 12% 3. Fungus 4. Improper irrigation 5. Bacteria 6. Virus 7. Parasitic plants Nematodes
5 1. Insufficient irrigation 17% 17% 17% 17% 17% 17% 2. mites 3. fungus 4. Poor pruning practices 5. Nutrient deficiency Pine beetles
6 25% 25% 25% 25% 1. Bacteria, fungi, viruses 2. Water, high temps, shade 3. Host, pathogen, favorable environment 4. Salinity, fungus, high ph
7 20% 20% 20% 20% 20% 1. Nitrogen deficiency 2. Iron or zinc deficiency 3. Overwatering Underwatering 5. All of the above
8 Problem: My date palm isn t producing dates. Never attempt to diagnose a disease over the phone, even if you are 99% sure.
9 B COTTONWOOD IN WINTER BERMUDAGRASS IN WINTER
10
11 All three factors must be present for disease to occur Susceptible Host Disease Favorable Environment Causal Agent
12 Full or partial sun Alkaline or acid soil Frequent fertilizer Pollinator
13 Are all species affected? Location on the property Location on the plant Sudden onset Gradually over time
14 Weather conditions Temperature Humidity Wind Hail Light Soil conditions: Moisture Texture Structure Ph Salinity Depth
15 Beneficials Predatory nematodes Mycorrhizae Nitrogen fixing bacteria Parasites Root-knot nematodes Predators rabbits
16 Change in the appearance of functioning of the plant as a result of the disease Chlorosis Wilting Stippling Interveinal chlorosis
17 Actual evidence of the causal agent Mycelia, frass, spores, ooze
18 QUEEN PALM GARDENIA
19
20 Over pruning Over watering Under watering (or not watering properly) Too much or too little light Over fertilizing ph or salinity issues
21
22
23
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25 Abiotic Corrected with deep winter irrigations
26
27
28 Animals: Insects,mites, nematodes Parasitic plants Fungi Bacteria Protists Virus
29 Symptoms: Small, stunted Chlorotic Wilt even when amply watered during warm weather Poor fruit set Fruits small Presence of knots on roots
30
31 Cotton (Texas) foot rot Only affects dicots Affects over 2300 plant spp. Symptoms: wilting and rapid death during hot months, dead leaves remain attached to plant
32
33 Occurs in smooth bark trees Sunburn - overpruning
34 Pose hazards Transmitted through wounds Mostly attacks dead cells Once conch visible the damage is extensive No treatment Ganoderma
35 Caused by Erwinia If lesion is small, remove and disinfect with 10% bleach
36 Caused by Agrobacterium tumefaciens
37 Occurs in tomato, peppers, spinach and beans, melons and squash Transmitted by beet leafhopper Leaves curl upward Develops in spring after wet year
38 Mostly affects cucurbits Whitefly transmitted
39
40 Systemic Acquired Resistance Attack by certain pathogens triggers series of events Whole plant responds
41 All three factors must be present for disease to occur Susceptible Host Disease Favorable Environment Causal Agent
42 Remember, Talk with most client, problems discuss plant are from choice, placement and care Bad plant choice Bad plant location Bad plant care If disease is still suspected, submit sample to MG diagnostics Don t try to diagnose over the phone If you believe you have ruled out the above submit sample for submission If diagnostic group can t solve problem, client will be advised to submit a sample to Tucson for diagnosis
43 1. Determine what is normal for the plant 2. Inquire about irrigation practices 3. Identify the plant 4. Recommend corrective pruning 5. Go to a big-box nursery department and ask for a product recommendation 20% 20% 20% 20% 20%
44 1. Poor pruning 2. Insects 12% 12% 12% 12% 12% 12% 12% 12% 3. Fungus 4. Improper irrigation 5. Bacteria 6. Virus 7. Parasitic plants Nematodes
45 1. Insufficient irrigation 17% 17% 17% 17% 17% 17% 2. mites 3. fungus 4. Poor pruning practices 5. Nutrient deficiency Pine beetles
46 25% 25% 25% 25% 1. Bacteria, fungi, viruses 2. Water, high temps, shade 3. Host, pathogen, favorable environment 4. Salinity, fungus, high ph
47 20% 20% 20% 20% 20% 1. Nitrogen deficiency 2. Iron or zinc deficiency 3. Overwatering Underwatering 5. All of the above
48 University of Arizona Extension Plant Pathology: The American Phytopathological Society: Top.html Western Plant Diagnostic Network:
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