plant problems and pests horticulture 2 c. vick. what is a pest? a pest is anything that causes...
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![Page 1: Plant Problems and Pests Horticulture 2 C. Vick. What is a pest? A pest is anything that causes injury to or loss of a plant (host plant) Categories:](https://reader037.vdocument.in/reader037/viewer/2022103123/56649d135503460f949e6d4a/html5/thumbnails/1.jpg)
Plant Problems and Pests
Horticulture 2
C. Vick
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What is a pest? A pest is anything that causes injury to or
loss of a plant (host plant) Categories:
Insects Nematodes Weeds Diseases Rodents
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Insects: Bio review:
Anatomy: 3 segments
Head, thorax, abdomen Exoskeleton 3 pairs of legs
Feeding: Determined by the
structure of its mouth Mandibles=chewing Elongated beaks=
piercing and sucking Reproduction:
Sexual in most; asexual in some like aphids
Life Cycle: Metamorhosis
Incomp: Egg-nymph-adult
Complete: Larvae-pupae-adult
Facts: Over 800,000 species of
insects Approx 100,000 of those
are found in the US Less than 1,000 are
considered pests of plants and people
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Insect-related pests: Spiders and mites
4 pairs of legs 2 body sections
Centipedes 2 pair of legs per body segment
Sowbugs and pillbugs seven pairs of legs
Snails, crayfish and slugs (snail with no shell)
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Damage by pests: Dependent of the life stage
Example with Japanese beetle: Larval stage (grub) may feed on grass roots Adult stage may feed on ornamental crops
Usually caused by feeding on plants Can be caused by their presence alone
(burrowing, nesting, mound-building)
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Insect control program: ID the insect and population/monitor Determine the potential for damage Assess the potential environmental issues Decide on control measures Use control measures Evaluate the results Assess resulting environmental issues
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Nematodes: Also known as roundworms Approx 500,000 species in
the world Approx 2,200 that are plant
parasitic (sizes range from 1/75 to 1/10 inches long)
Female uses stylet mouth to piece host and to feed (Injecting enzymes to prepare cellular contents for ingestion)
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Nematode Diagnosis: Be careful to not diagnose on symptoms alone as
they can mimic other conditions: Low or unbalanced fertility Sun scald or frost damage Poor drainage Drought damage Insect or mite injury Wilt or root-rot fungi Herbicide damage
Accurate diagnosis requires laboratory testing
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Nematode Prevention: Note: some nematodes may be beneficial in plant
growth Preventing harmful nematodes:
Categories: Ecto-parasitic (attached outside host) Endo-parasitic (feed externally on host and internally within
the roots) Semi-endo-parasitic (partially embedded)
Preventative measures: Use disease-free planting materials Proper site preparation Follow cultural practices to ensure steady and vigorous plant
growth
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Nematode Treatment: How to determine if treatment is warranted:
Look at population numbers per 100 cc of soil Nematode action threshold varies by type of worm and host:
Sting nematodes=10 Lance nematodes=60 Ring nematodes=500 EXCEPT in centipedegrass which then =150 Stubby-root nematodes=100 Root-knot nematodes=80
Monitor the above in spring and summer when populations are at their peak
Correct other problems before resulting to chemical means: pH Fertility Insect damage Population combinations and numbers
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Root-knot nematode damage to a tomato plant:
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Root-knot root damage:
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Banana crop damaged by nematode worms