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Onion Insects A
Lecture To ToT trainees ( FFS) By
Mr. Allah Dad Khan Provincial Coordinator
IPM KPK MINFAL Pakistan
• Crop: OnionScientific name: Allium cepaFamily: Solanaceae
Thrips (Onion thrips, Western flower thrips)Thrips tabaci
Frankliniella occidentalis
Symptoms
• Discolored, distorted tissue; scarring of leaves; severly infected plants may have a silvery appearance; insect is small (1.5 mm) and slender and best viewed using a hand lens; adult thrips are pale yellow to light brown and the nymphs are smaller and lighter in color
• Cause• Insect
LeafminersLyriomyza spp.
Symptoms
• Thin, white, winding trails on leaves; heavy mining can result in white blotches on leaves and leaves dropping from the plant prematurely; early infestation can cause yield to be reduced; adult leafminer is a small black and yellow fly which lays its eggs in the leaf; larvae hatch and feed on leaf interior
• Cause• Insects
Onion maggotDelia antiqua
Symptoms
• Stunted or wilting seedlings; plant will commonly break at soil line if an attempt is made to pull it up; if infestation occurs when plants are bulbing, bulbs will be deformed and susceptable to storage rots after harvest; adult insect is a greyish fly which lays white, elongate eggs around the base of the plant; the larvae that emerge from the eggs are tiny and white and bore into the plant; mature larvae are about 1 cm (0.4 in) long with feeding hooks
• Cause• Insect
Bulb mites Rhizoglyphus spp.Tyrophagus spp.
Symptoms
• Stunted plant growth; reduced stand; bulbs rotting in ground or in storage; pest is a cream-white, bulbous mite <1 mm in length, which resembles a pearl with legs
• Cause• Arachnid
Onion Fly: Delia antiqua
Symptoms• of damage:• Onion leaves get rotten,
shredded and rolled up• Growth of onion tubers gets
hampered, tissues get decayed and becoming unfit for marketing
Identification of Pest:
• Egg: long whitish colour eggs are laid on the undersurface of onion near soil
• Larva: Whitish and adopous• Pupa: Pupation takes place
in soil• Adult: Grey coloured fly
Ear wig: Euborellia annulipes
Symptoms of damage:
• Both nymphs and aduts bore into the onion bulb and feed.
Identification of pest:
Stages • Eggs: are laid only in the
tender leaf• Adult: The colour of the
insect varies from pale yellow to grey