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Key Plants and Key Pests in North Florida Landscapes Podocarpus, Gardenia, Camellia, and Pyracantha Rebecca McNair University of Florida Extension.

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Presentation on theme: "Key Plants and Key Pests in North Florida Landscapes Podocarpus, Gardenia, Camellia, and Pyracantha Rebecca McNair University of Florida Extension."— Presentation transcript:

1 Key Plants and Key Pests in North Florida Landscapes Podocarpus, Gardenia, Camellia, and Pyracantha Rebecca McNair University of Florida Extension

2 IPM Integrated Pest Management Natural processes of control are emphasized –Host plant resistance –Pest exclusion –Prevention and through cultural practices –Physical Control –Biological control through natural enemies –Chemical control as a last resort Tolerance Monitoring

3 Podocarpus Nageia nagi

4 Podocarpus- Key Pests Diseases Mushroom root rot Other Nematodes Magnesium deficiency

5 Mushroom Root Rot Slow decline, thinning of canopy Gray-green color White mycelia under bark at soil line Armillaria tabescens

6 Remove diseased plants and roots Fumigate soil before replanting Root Rot Management Armillaria tabescens fruiting body appears in fall.

7 Root nodules Beneficial nitrogen-fixing blue green algae Often mistaken for root knot nematodes Active nodules have a pink milky fluid in their centers Hemoglobin within the nodule fixes atmospheric nitrogen. When exposed to oxygen, the fluid inside changes from blue to pink!

8 Endoparasitic nematode Feeds on root tissues Dieback, decline, chlorosis Identify under microscope Roots infected with Meloidogyne are swollen. Root Knot Nematodes

9 Nematode Management Meloidogyne sp. Fumigate Solarize soil Buy plants grafted with resistant varieties Provide adequate water and fertilizer Remove and replace plants and soil egg mass

10 Yellow inverted “V” Occurs on mature leaves Low soil pH Lack of soil Mg Management Increase pH with dolomite Apply Epsom salts or Mg fertilizers Magnesium Deficiency

11 Gardenia augusta Acid loving plant Fragrant flowers

12 Gardenia- Key Pests Other Nematodes Manganese deficiency Environmental stress Diseases Stem Canker

13 Sudden wilting Chlorosis Leaf spots Yellow halo around lesions Stem cankers Galls, usually at the soil line Girdling may occur

14 Stem Canker Fungus pathogen enters injured tissue Spores spread by splashing water Management Minimize plant injury Avoid overhead irrigation Phomopsis gardeniae Notice the yellow halo around the leaf spots on this gardenia.

15 Nematodes Roundworms Root Knot nematodes live inside plant roots All live in liquids, i.e. water in soil Feed on plant sap Damage roots Inhibit growth

16 Root-Knot Nematodes Decline and thinning of canopy Roots brown, stunted and galled Decline due to root knot nematodes compared to a healthy gardenia.

17 Nematode Management Fumigate Solarize soil Buy plants grafted with resistant varieties Provide adequate water and fertilizer Remove and replace plants and soil Meloidogyne sp

18 Manganese Deficiency Interveinal chlorosis on new growth Reduced leaf size Necrotic distortion of new growth Common in alkaline soils high in phosphorous Management Use a complete fertilizer with micronutrients

19 Environmental Stress Bud drop Chlorosis Excessive water or fertilizer Cold or temperature fluctuation Nutrient Deficiency Drought High pH Mechanical damage Management Correct cultural problems Provide cold protection Prune and re-grow

20 Camellia japonica Acid loving Prefers partial shade Fragrant flowers from late winter to early spring

21 Camellia- Key Pests Diseases Crown Gall Petal blight Leaf spot Twig dieback Other Environmental stress

22 Gall Agrobacterium tumefaciens is a common soil bacterium that causes crown gall disease by transferring some of its DNA to the plant host. This has enabled scientists to genetically manipulate plants, a technique called transformation. Galls can appear on any plant part and may be due to bacteria, fungi, nematodes, or insects.

23 Petal Blight Cibornia camelliae (formerly Sclerotinia) Irregular, brown spots Dark veins Blighted flowers drop Prefer warm, moist conditions Ascospores are spread by water Fungus overwinters as sclerotia, a hard black structure that remains viable for 5 years Sclerotia

24 Petal Blight Control Suppress sclerotia development Remove all infected flowers, leaves, and litter Promptly burn or bury diseased materials (at least 1 ft deep) Limit overhead irrigation Cibornia camelliae fruiting body.

25 Cerscospora caloloma Circular or irregular lesions Margins raised Brown - gray Fungus favors high humidity and partial shade Management Limit overhead irrigation Avoid crowding Copper fungicides Fungal Leaf Spot

26 Algal Leaf Spot Cephaleuros virescens Wide host range Smooth leathery leaves are more prone to infection One of the few green algae parasitic on higher plants Management Limit overhead irrigation

27 Twig Dieback Twig dieback and a healthy camellia. Fungus Summer-winter: cankers Spring: Young shoots wilt and die Brown leaves remain on the dead shoots Glomerella cingulara

28 Twig Dieback Management Prune infected areas, including cankers Fungicides Leaf scars are most common point of entry Often confused with root rots Plants can be infected by both Root rot increases the severity of twig dieback

29 Environmental Stress Bud Drop High heat and light Temperature fluctuation Drought Mechanical damage Management Maintain adequate water

30 Pyracantha coccinea Firethorn Prefers full sun Will grow in partial to fairly heavy shade Fast growing

31 Pyracantha- Key Pests Diseases Fireblight

32 Bacterium New shoots wilt suddenly and die Dead leaves remain on the shoots Spread by bees and splashing water Erwinia amylovora

33 Fireblight Bacteria enter through flowers and infection spreads into the stem Management Limit overhead irrigation Remove infected branches Use resistant varieties

34 Authors: Rebecca McNair Reviewers: Dr. Russ Mizell, Dr. Norman Leppla, Dr. Doug Caldwell, Celeste White, and Christine Kelly- Begazo Funding: Florida Yards and Neighborhoods Photos: Thanks to the Florida Dept. of Agriculture and Consumer Services, Division of Plant Industry, and University of Florida Extension faculty for providing photographs, including: Dr. James CastnerDr. Catherine Mannion Dr. Lance OsborneDr. Avas Hamon Dr. Norman Leppla Dr. George Agrios Bill GravesDr. Doug Caldwell Holly GlennDr. Tim Schubert Dr. Eileen Buss Acknowledgements


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