Insect Pests of Canola DALE WHALEY WSU REGIONAL EXTENSION SPECIALIST WATERVILLE, WA
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1 Insect Pests of Canola DALE WHALEY WSU REGIONAL EXTENSION SPECIALIST WATERVILLE, WA
2 What We Want!
3 Insect Pests of Canola Several Others
4 How do you know when to treat the field? Calendar Approach
5 IPM Decision Management Process AD
6 IPM Decision Management Process AD
7 How do you know when to treat the field?
8 Field Samples Types: Sweep Net Beat Sheet Stem Sampling Sticky Traps
9 Where to Take Samples? Canola Field
10 Where to Take Samples? Canola Field
11 Suggested Sampling Methods Figure 1. Suggested sampling plan for obtaining representative estimating insect populations. A "W" shaped patterns may also be used.
12 1) Pest Description: Cabbage Seed Pod Weevil - Adult weevils are ash-grey and approximately 3 to 4 mm long. They have a prominent curved snout that is typical of most weevils.
13 2) Lifecycle: Cabbage Seed Pod Weevil
14 3) Damage/Symptoms: Cabbage Seed Pod Weevil - Canola pods harboring cabbage seedpod weevil larvae often appear distorted.
15 4) Monitoring: Cabbage Seed Pod Weevil
16 4) Monitoring: Cabbage Seed Pod Weevil Field
17 Cabbage Seed Pod Weevil 5) Thresholds/Management: - Insecticide application is warranted when an average of 30 to 40 adult weevils are collected per (10) sweeps.
18 Cabbage Seed Pod Weevil 5) Management Options: Cultural control: - Trap Crops - Trap border/ strip of early flowering Canola variety. - Trap border/strip same field variety planted 7 to 10 days early.
19 Cabbage Seed Pod Weevil 5) Management Options: Chemical: - Seed treatments / Foliar sprays - Spray when the insects are active - * Minimize non-target effects
20 Cabbage Aphid 1) Pest Description: - Aphids are small pear-shaped insects that will have cornicles (a pair of tube-like structures attached to the abdomen).
21 2) Damage/Symptoms: Cabbage Aphid
22 2) Damage/Symptoms: Cabbage Aphid -As the heads emerge and bloom begins, aphids will concentrate on the heads.
23 3) Monitoring/ Thresholds: Cabbage Aphid - Canola should be scouted bi-weekly for aphids. - Treat for aphids when populations exceed: - 2 per plant in the seedling stage. - 5 per leaf in the rosette stage. - or when 20% of the heads are infested during bloom.
24 4) Management Options: Cabbage Aphid Biological Control: - Several natural enemies help to regulate aphid populations. Chemical control: - Do not treat late-blooming canola for aphids because populations usually decline after bloom.
25 Lygus bug (Tarnished Plant Bug) 1) Pest Description: - Adults are approximately 3 mm wide and 6 mm long, oval, colored pale green to reddish brown or black. - They have a distinctive triangle or V-shape on their backs. Adult Nymph
26 Lygus bug (Tarnished Plant Bug) 2) Damage/Symptoms: Adult feeding on developing bud Puncture Points from Lygus Bug Feeding on Canola Stem
27 Lygus bug (Tarnished Plant Bug) 3) Monitoring: - Start scouting fields at the bud stage. - Sample (sweep net) when the temperature is above 20 C and the crop canopy is dry. - Take 10, (side to side) sweeps through the bud area.
28 Lygus bug (Tarnished Plant Bug) 4) Thresholds/Management: Treat if: - 15 Lygus bugs (bud stage - petal drop) (10 sweeps) - 20 Lygus bugs after petal drop (10 sweeps)
29 Lygus bug (Tarnished Plant Bug) 5) Management Options: Biological: Lygus bugs have several natural control agents. Chemical: There are several registered Insecticides like (Imidacloprid or Bifenthrin) that can be used once populations have reached economic threshold levels.
30 Flea Beetle/Striped Flea Beetle 1) Pest Description: - Shiny, 2 3 mm and have enlarged hind legs. Flea Beetles - Phyllotreta Cruciferae (Goeze) Striped Flea Beetle - Phyllotreta Striolata (F.)
31 2) Lifecycle: Flea Beetle/Striped Flea Beetle
32 Flea Beetle/Striped Flea Beetle 3) Damage/Symptoms: - Moderate to severe leaf feeding
33 Flea Beetle/Striped Flea Beetle 4) Monitoring: Field - Continue scouting for 2 weeks, especially on sunny, calm days.
34 Flea Beetle/Striped Flea Beetle 5) Thresholds/Management: - The economic threshold for flea beetle feeding on canola is when there is 25% defoliation and flea beetles are present. - Canola seedlings can withstand 50% leaf loss.
35 Flea Beetle/Striped Flea Beetle 5) Management Options: Cultural control: - Seedling Vigor, the larger the seedling, the more it can withstand injury from flea beetle feeding. - Crop rotation? Crop rotation is not an effective means of controlling flea beetles. Adults overwinter inside and outside of the cropped areas and are capable of long- range migration. Biological Control: - NO, flea beetles emerge in large numbers during a relatively short period of time and tend to overwhelm the parasites and predators.
36 Flea Beetle/Striped Flea Beetle 5) Management Options: Chemical: - Seed treatments or post-emergent foliar sprays
37 Additional Canola Insect Pests - Alfalfa looper - Bertha Armyworm - Beet webworm - Cabbageworms - Clover Cutworm - Diamondback moth - Grasshopper* - Painted Lady, Thistle Butterfly - Red Turnip Beetle - Root Maggots
38 Thank You Helping You Put Knowledge to Work
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