MAJOR PEST

CHEMICAL USED

DOSAGE

MODE OF ACTION

ANY OTHER REMEDIES

   THRIPS

Acephate 70SP

Spinosad

Diazonon 50wp

500ml/ha

1.25-2.5oz

4-8 oz

It is a systemic insecticide.

 Provide separation.

Natural enemies like predatious mites,lacewings, piratewings.

Cultural control-avoid planting onion near grain fields.

ONION MAGGOTS

Chloropyriphos 20EC

1ltr/ha

Acts as contact & stomach poison. Wax layer of the cuticle  is dissolved by the insecticide.

Natural enemies-lady bugs,beetles,wasps etc.Cultural control-avoid successive onion crop.

ARMYWORM

Carbofuron 3G

Cypermethrin

Permethrin

7.5kg/ha

0.04-0.11 lbs/ac

0.15-0.3 lbs/ac

Systemic

These are synthetic pyrethroids.-have quick knockdown effect.

Natural enemies-Bauveria bassiana,trichogramma.Destroy larvae & pupae.

CUTWORM

Dust carbaryl 5% or spray dichlorovos 0.05%

Dichlorovos 5ml/ltr

It is a systemic insecticide .It kills the hidden insects.

Put cardboard collar around new transplants to extend 1” to 2” above & below soil level.

CLICKBEETLE-GRUB

Chloropyriphos 20EC

1ltr/ha

Contact & stomach poison.

Cultural control-avoid successive onion crop. soil treatment .

ONION FLY

Acephate 70SP

500ml/ha

It is a systemic insecticide.

Grow resistant varieties, seed & soil treatment with 5% aldrin dust.

SPIDER MITE

Dicofol 18.5EC

1250ml/ha

It is a contact poison

Cultural control includes flood irrigation.

LEAF MINER

Cypermethrin

0.04-0.11 lbs/ac

It is a systemic insecticide .It kills the hidden insects

Natural enemies-lady bugs,beetles,wasps etc.

STEM & ROOT NEMATODE

Nematicides

Cartap hydrochloride

10kg/ha

Systemic

Crop-rotation, fumigation of seeds. Trap crops-marigold.

STUBBY ROOT NEMATODE

Carbofuron 3G

Aldicarb(temik)

7.5kg/ha

10kg/ha

Systemic

Systemic

Flooding the infected area. Trap crops-marigold.

BLACK MOLD

Bayleton WP,bavistin WP(carbenbazim) 0.1%

   1gm/ltr

 Systemic

Cultural control-proper handling, storage at 33-55 degree F.

BOTRYTIS LEAF BLIGHT

Bayleton WP,bavistin WP(carbenbazim),

tridemorph(0.1%)

    1gm/ltr

    Systemic

Cultural control-proper handling & drying. destroy the infected seedlings.

    SMUDGE

Vitavax

Raxil(tebaconazole)

1gm/ltr

1gm/ltr

   Systemic

Cure & dry onions properly

Quick drying after harvest. Store under cool, dry conditions.

DOWNEY MILDEW

Metalaxyl

Metalaxil MZ(ridomil MZ)

(metalaxyl+mancozeb)

1.5 lbs/ac

6gm/ltr

Both contact & systemic

Cultural control includes Crop rotation.

GRAY MOLD

Bayleton WP,bavistin WP(carbenbazim) 0.1%

   1gm/ltr

 Systemic

Cultural control-proper curing & careful handling.

PURPLE BLOTCH

Iprodione(rovrol)

Vinclozolin

Mancozeb(dithane M-45)0.2%

2gm/ltr

0.75 lbs/ac

2gm/ltr

Contact

Contact

Cultural control-proper handling & drying. destroy the infected seedlings.

SOUR SKIN

        -NO-

    __

        __

Cultural control-practice furrow irrigation rather than sprinkler irrigation.

POWDERY MILDEW

Dusting with wettable sulphur @ 0.5%

5gm/ltr

  Systemic

Cultural control-practice

Crop rotation.

FUSARIUM BASAL ROT

Carbendazin,

Hexaconazole 0.1%

1gm/ltr

   Systemic

Cultural control-three to four year crop rotation.

       RUST

Hexaconazole

Mancozeb

Plantavex

1gm/ltr

2gm/ltr

1gm/ltr

Systemic

Contact

Systemic

Cultural control-Avoid planting in or near fields with a history of rust.

FUSARIUM DAMPING OFF

 Fungicides

Metalaxyl-MZ

Carbendazein

Carbendazein

6gm/kg seed

2gm/kg seed

1gm/ltr spray

   Systemic

Cultural control-provide proper drainage.Biocontrol agent like trichoderma-4 to 6gm/kg seed.