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IIHR weather report

CROP WEATHER SITUATION

METEOROLOGICAL DATA OF

ICAR-INDIAN INSTITUTE OF HORTICULTURAL RESEARCH

 HESSARAGHATTA, BANGALORE – 560 089

 

Period: 1st to 15th March, 2017

 

Latitude: 13071 N                   Longitude: 770 291E              Altitude: 890 M

 

Fortnight

Temperature (0C)

Relative Humidity (%)

 

Evaporation

(mm)

 

Wind speed

(km/h)

 

Total Rainfall

(mm)

Average

Max.

Average

Min.

Average

At 7.30AM

Average at 1.30 PM

March

1st to 15th,

2017

31.7

20.0

72.6

44.8

5.7

2.58

26.35

(31.3)

 

(17.5)

     (53.1)

    (28.5)

    (5.7)

  (4.9)

 

(4.8)

 

* Figures in the parentheses indicate the average values during the corresponding period for the previous 5 years

 

Fortnight from 1st to 15th March, 2017

 

During the first fortnight of the month i.e., from March 1st to 15th, 2017, the average maximum and minimum temperature were higher by 3.00C and 5.00C respectively, as compared to the previous fortnight. The average maximum and minimum temperature were higher by 0.90C and 0.80C respectively, as compared to the average values of the corresponding period for the previous five years. The percent relative humidity during morning and afternoon were higher by 18.0%, and 26.5% respectively, as compared to the previous fortnight. There was 26.35mm rainfall during the fortnight.

 

Crop weather situation

 

As the average minimum and maximum temperatures are high sufficient supplemented irrigations may be provided if any summer season vegetables are being grown. Straw mulching may be provided to both fruit and vegetable crops at the basins to reduce evaporation losses and ambient temperatures. The weather during the first fortnight of March, 2017 was suitable for the cultivation of Milky mushroom and Oyster Mushroom (Pleurotus spp.) with additional humidity requirement. Oyster mushroom showed lower yield and lighter sporophore colour with longer stripes and loose bunches due to higher temperature.

 

Incidence of pests and diseases

 

Under the prevailing weather situation, following pests are expected under Bangalore conditions on various horticultural crops. Various management options for their management are mentioned below.

 

Mango Hoppers

 

  • On mango, incidence of hoppers may continue wherever flowering is delayed. Spray azadirachtin @ 3ml/lt. or thiamethoxam @ 0.3 g/lt. or lambda cyhalothrin 5 EC @ 0.5 ml/lt. at early panicle emergence. This will also be helpful in checking the thrips.

 

Mango stone weevil management

 

  • Wherever fruits reached lemon size (2-4 cm diameter), a spray of deltamethrin @ 1ml/lt. will be effective.

 

Fruit fly Management

 

  • In orchards where fruit set occurred early and they attained full size, erect methyl eugenol based fruit fly traps @ 6/acre. Collect and destroy fallen fruits.

 

Mealy bugs on grapes

 

  • Incidence of mealybugs may increase during this period.
  • Encourage natural enemies such as lady bird beetle. If incidence is high than spray difenthiuron 50 WP 1g/lt. and repeat the spray after 2 weeks.

 

Leaf miner on tomato

 

  • Incidence of leaf miner is observed on tomato. For its management spray indoxacarb @ 0.75 ml/lt. or spinosad @ 0.3ml/lt.

 

Mites on tomato

 

  • For the management of mites on tomato, spray spiromesifen 22.9 SC@ 1ml/lt.

 

Whiteflies on tomato

 

  • Incidence of whiteflies is noticed on tomato.  For their management spray difenthiuron 50 WP 1g/lt.

 

Brinjal shoot and fruit borer

 

  • For the management of brinjal shoot and fruit borer, spray rynaxypyr @ 0.3 ml/l rotate with emamectin benzoate 0.3g/liter followed by indoxacarb @ 0.75 ml/lt.

 

Thrips on rose

 

  • For the management of thrips on rose, spray imidacloprid @ 0.5 ml/l or fipronil 5 SC @ 1.5ml/lt.

 

Disease Scenario

 

Disease forecast based on weather parameters during the first fortnight of March, 2017.

 

Grape

 

  • Anthracnose and Powdery mildew (Uncinula necator) infection may be noticed. For anthracnose application of Difenoconazole (0.05%)/ Thiophanate methyl (0.1%) / Carbendzim + Mancozeb (0.2%) /Bitertanol (0.2%) whereas for powdery mildew Application of Azoxytrobin (0.1%) or Triadimefon (0.1%) along with sticker @ 0.5 ml/ l is recommended for the management of disease.

Mango

 

  • Powdery mildew requires attention. At this point of time application of wettable suphur is not advisable because of high temperature. Anthracnose spots might further increase on foliage. Application of Mancozeb + Dinocap (Dikar) (0.3%) or Tridemorph (0.1%) or Hexaconazole (0.1%) is recommended for the disease management. Severity of Anthracnose spots might increase. Application of Difenoconazole (0.05%) or Thiophanate methyl (0.1%) is recommended along with sticker @ 0.5 ml/ l.
  • Sooty mould should be still taken care. Application of Copper oxychloride (0.3%) along with sticker (@ 0.5 ml / L) is recommended. Further hopper and other insect management is important with suitable insecticides (Imidacloprid @ 0.5%).


Vegetables

 

  • Anthacnose in vegetables will increase especially in chillies.  For anthracnose application of Difenoconazole (0.05%)/ Thiophanate methyl (0.1%) / Carbendzim + Mancozeb (0.2%) /Bitertanol (0.2%) along with sticker 0.5ml/l will be effective.

 

Virus diseases

 

  • Change in weather especially low humidity with increase in temperature favours sucking pests which are vectors of many virus diseases.  Seed treatment with imidacloprid or spray of acephate (0.2%) will be effective in controlling vector population.
 
 

Updated on 27.03.2017

 

 

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