Plants for Landscape Design HORT 608 Fall Disease, Pest, and Cultural Practices Impact Landscape Design Sustainability
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1 Plants for Landscape Design HORT 608 Fall 2018 Disease, Pest, and Cultural Practices Impact Landscape Design Sustainability
2 Required Reading There is no formal required reading with this lecture, but remember that many of the terms covered in this lecture are in the glossary of your text and you should look them up if you are not familiar with them. Also color images of some pest, disease, and cultural conditions referenced in this section are provided in the first color plate section of your text.
3 90 / 10 Rule Thousands of potential pathogens / pests A few common diseases and pests account for many of our landscape problems Separate pest, disease, and mechanical damage Important to recognize pathogen / pest damage from physiological disorders / deficiencies Often a complex of causal factors are the culprit Cultural conditions interact with all of the above and the plants Susceptible host Favorable Environment Virulent pathogen
4 Physiological Disorders Mineral nutrient deficiencies/toxicities Physiological leaf scorch Spray injuries Intentional sprays or unintentional drift Lightening strike Mechanical injuries Chemical injuries Sun scald Winter injury Circling roots Inadequate chilling
5 Susceptibility to physiological problems vary within a species Provenance versus seed source!
6 What s Causing This Damage?
7 Site Interacts With Disorders/Disease
8 Common Pests Insects Chewing (grasshoppers, Japanese Beetles, caterpillars, borers, bagworms, leaf miners, ants, termites) Rasping (thrips) Piercing/sucking (aphids, weevils, mealy bugs, scales, whiteflies, leafhoppers, Chewing P&S Piercing / sucking sharpshooters) Chewing Rasping Chewing Piercing / sucking Piercing / sucking
9 Common & Uncommon Pests Arachnida (spiders, spider mites, scorpions) Mollusca (slugs / snails with slim trails) Spider mites
10 Common & Uncommon Pests Mammals (deer, rabbit, mole, vole, raccoon, mice, rats, wild hogs, armadillos, prairie dogs, dogs, beaver, bear, gophers ) Birds, lizards, turtles, snakes Humans (particulary subhumans kids!) WindbreakTrees.com
11 Common Disease Problems Bacterial Angular lesions, often near veins Leaf spots (zinnia, Xanthomonas on geraniums) Twig dieback, cankers (fire blight) Phloem infections (wetwood / slime flux) Xylella fastidiosa (fastidious xylem inhabiting bacteria) Crown gall (Agrobacterium tumefaciens)
12 Common Disease Problems Fungal Circular lesions / spores Root rots (cotton root rot) Foliar diseases (sooty mold, Entomosporium leaf spot, black spot, powdery mildew) Xylem clogging (Dutch elm disease, Verticillium wilt, Fusarium wilt, oak wilt) Cankers (chestnut blight) Twig dieback (juniper blight, anthracnose) Damping-off (Pythium, water molds)
13 Entomosporium leaf spot Redtip Photinia Indian Hawthorn Indian Hawthorn
14 Common Disease Problems Viral (yellow mottle & bud drop of Camellia, tulip breaking virus, rose rosette virus) Mycoplasma-like (lethal yellows of palms) Viroids (chrysanthemum yellows) Nematodes / Nemas (root knot nematodes, microscopic eelworms) Courtesy Dr. Kevin Ong
15 Cultural Conditions Are Often To Blame Weedeater / lawn mower blights Construction damage Poor site prep / design / installation Shade / sun patterns Poor maintenance practices Irrigation practices Fertility Pruning Staking Mulching Planting Circling / girdling roots Improper pruning Improper staking Lawn mower blight
16 Other cultural practices Exposed Roots Windthrow from roots only in mulches Fill Soil & Compaction Graft incompatibility Graft incompatibility
17 Firewood Landscapes
18 Establishment Practices Are Critical Survival after 3 years (%) Crapemyrtle Green ash Oleander Sycamore Vitex Planting depth (in) Avoid planting too deep!
19 Be Sparing On Pine Bark Mulch Survival (%) Koelreuteria bipinnata Image courtesy Dr. Douglas Airhart Pine bark mulch (cm) More is not always better!
20 Irrigation issues Zoning plants Keeping the bank account in the black Quantity & quality Salinity / ph concerns Subcanopy applications are critical for our region Interactions with soil conditions
21 Cost-benefits to site modifications Soil replacements Soil amendments Typical home site in Central Texas
22 Cost-benefits to site modifications Raised beds / planters
23 Traits To Consider When Selecting Adapted Plants For Our Region Specific challenges in our region High day & night temperatures Poor internal drainage in many soils High salts / bicarbonates in irrigation water High ph soils in many locations Widely fluctuating winter temperatures Thin rocky soils or heavy clays Limestone soil Salt crust from irrigation Expansive clays
24 Be Cognizant of Hazardous Plants Cactus 1 : boy 0 (as in 0uch!)
25 Design Solution to Leaf Raking? Image Courtesy of a former student
26 Questions / Comments? All material represented herein are copyrighted by the author, or otherwise as indicated, with all rights reserved. For permission to reproduce text or images from this presentation write: Dr. Michael A. Arnold Dept. of Horticultural Sciences Texas A&M University College Station, TX ma-arnold@tamu.edu
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