Kelly Young Horticulture Agent University of Arizona Cooperative Extension, Maricopa County

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Arleen Rogers
5 years ago
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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

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

20 Over pruning Over watering Under watering (or not watering properly) Too much or too little light Over fertilizing ph or salinity issues

25 Abiotic Corrected with deep winter irrigations

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

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

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

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

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

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:

Tree and Shrub Disease

Tree and Shrub Disease n t h r a A n t h r a c n o s e A number of different trees are affected by anthracnose disease. This fungal disease can cause severe leaf blighting and deformation, but in many cases the damage to the