Insect Pest Identification and Organic Control

Sucking Insects

These pests pierce plant tissue and extract sap — causing wilting, yellowing, and virus transmission.

Aphids

Appearance: Small (1–3mm), soft-bodied, green/black/brown; clusters on new growth and undersides of leaves Damage: Curled leaves; stunted growth; sticky honeydew → black sooty mold Season: Cool seasons, shaded conditions

Organic controls (in order of preference):

1. Water jet spray (strong stream from hose) — disrupts colonies
2. Ladybird beetles (natural predators) — attract by not using pesticides
3. Neemastra spray (5%)
4. Neem oil 0.5% + soap (2g castile soap/L as spreader)
5. Agniastra 3%

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Whiteflies

Appearance: Tiny white-winged insects; adult flies off when plant disturbed; nymphs are scale-like on leaf undersides Damage: Sucks phloem sap; transmits viruses (especially in tomato, chili, cotton) Key crops: Tomato, chili, cucumber, cotton, brinjal

Organic controls:

1. Yellow sticky traps (1 per 10 m²) — most effective non-spray
2. Beauveria bassiana spray 2g/L (entomopathogenic fungus)
3. Neem oil 0.5% foliar spray
4. Reflective silver mulch on soil surface — confuses whiteflies
5. Encarsia formosa (parasitic wasp) — commercial release

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Thrips

Appearance: Very tiny (1–2mm), yellow/brown; move rapidly; hard to see Damage: Silvery streak marks on leaves; flower/fruit damage; deformed fruits; virus transmission (TSWV in chili) Key crops: Chili, onion, cotton, cucumber

Organic controls:

1. Blue sticky traps (thrips prefer blue > yellow)
2. Beauveria bassiana + Metarhizium mixed spray
3. Neem oil 0.5%
4. Spinosad 0.4 mL/L (NPOP permitted; strongest organic option)
5. Reflective mulch

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Mealybugs

Appearance: White cottony masses on stems, leaf axils, roots Damage: Sucking sap; producing honeydew; weakening plants Key crops: Sugarcane, papaya, grapes, coffee, cotton

Organic controls:

1. Neem oil + soap spray (persistent coverage needed)
2. Cryptolaemus montrouzieri (mealybug destroyer beetle) — commercial release
3. Agniastra spray
4. Beauveria bassiana
5. Manually remove cottony masses and destroy

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Caterpillars and Moths

Lepidopteran larvae are the most damaging chewing insect group.

Bollworm / Pod Borer (Helicoverpa armigera)

The most economically damaging pest in India. Affects cotton (boll damage), chickpea (pod damage), tomato (fruit boring), sorghum (head damage).

Organic controls:

1. Bt spray (Bacillus thuringiensis var. kurstaki) — 2 mL/L, apply at egg hatch stage, repeat every 5–7 days. Most effective specific control.
2. NPV (Nuclear Polyhedrosis Virus) — species-specific virus, highly effective; mix with Bt for synergy
3. Pheromone traps — Delta traps with Helicoverpa lure (monitoring + mass trapping)
4. Trichogramma egg parasitoid release — 1 lakh/acre/week during egg-laying period
5. Neem oil at petal fall stage

Cutworms

Damage: Cut seedlings at soil level overnight — classic "soldier ant attack" look Control:

• Pitfall traps (tin cans around affected area)
• Bacillus thuringiensis (soil drench)
• Wood ash ring around plant bases

Leaf Miners

Damage: Silvery trails on leaves — larvae tunnel inside leaf Control: Neem oil 0.5% + Beauveria

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Borers

Stem Borer (Rice, Sugarcane, Maize)

Appearance: Entry holes in stem; sawdust-like frass Damage: Dead heart (vegetative stage); white ear (reproductive stage); huge yield loss

Organic controls:

1. Trichogramma chilonis release (1 lakh eggs/acre/week — attacks borer eggs before hatching)
2. Beauveria bassiana 2g/L spray at whorl stage
3. Bt spray at egg hatching
4. Light traps to kill adult moths
5. Pull and destroy affected tillers immediately

Shoot Fly (Sorghum, Maize)

Damage: Dead heart in seedlings; "onion leaf" symptom Control: Seed treatment with Beauveria + Trichoderma; early planting to escape peak period; resistant varieties

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Soil Pests

Termites

Damage: Attack crop roots, base of stem; serious in dry soils Control:

• Neem cake 200 kg/ha in soil at planting
• Beauveria bassiana 2 kg/ha soil drench
• Keep soil moist (termites prefer dry soil)

Root Grubs (Holotrichia spp.)

Damage: Larvae attack roots; wilting and death of plants Control:

• Beauveria bassiana 2–4 kg/ha soil application at planting
• Metarhizium anisopliae soil drench
• Light traps for adult beetles during monsoon emergence

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Pest Control Comparison Chart

Pest	First Choice	Second Choice	Emergency Option
Aphids	Water jet + beneficials	Neemastra	Neem oil + soap
Whiteflies	Yellow traps	Beauveria	Neem oil
Thrips	Blue traps	Beauveria	Spinosad
Caterpillars	Bt spray	NPV + Bt	Agniastra
Stem borer	Trichogramma release	Beauveria	Bt at whorl
Termites	Neem cake	Beauveria soil	—

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Next: Disease Management