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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 April, 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

April

1st to 15th,

2017

32.1

17.9

69.9

27.4

6.5

7.9

21.65

(33.1)

 

(20.4)

(70.0)

(43.2)

(6.4)

(4.6)

 

(7.5)

 

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

 

Fortnight from 1st to 15th April, 2017

 

During the first fortnight of the month i.e., from April 1st to 15th, 2017, the average maximum temperature and minimum temperature were lower by 1.90C and 0.10C respectively, as compared to the previous fortnight. The average maximum temperature was lower by 0.70C and minimum temperature was higher by 0.70C respectively, as compared to the average values of the corresponding period for the previous five years. The percent relative humidity during morning was higher by 3.6%, whereas during evening it was lower by 14.4% respectively, as compared to the previous fortnight. There was 7.5 mm rainfall during the fortnight.

 

Crop weather situation

 

Recorded rainfall during first fortnight of April 2017 was 21.65 mm and found to be high compared to last five year’s average (7.5 mm). Further, the temperature (32.10C) was found to 10C less compared to five year’s average (33.10C).  This indicates the changes in weather pattern compared to previous fortnights. Hence, it is recommended to stop giving supplementary irrigation to the well established fruit crops orchard. However, supplementary irrigation to the standing vegetable crops as well as newly established fruit crops orchard may be continued with increasing irrigation frequency intervals. Foliar spray of micronutrients may be given to vegetable crops and fruit crops as deficiency symptoms may appear now. Weather during the fortnight 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 stipes 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 stone weevil management

 

  • Wherever fruits reached lemon size (2-4 cm diameter), a spray of acephate @ 1.5g/L followed after two weeks by deltamethrin @ 1ml/L. This will also take care of thrips incidence on fruits which is becoming serious in some parts with rising temperatures.

 

Fruit fly Management

 

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

 

Leaf miner on tomato

 

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

 

Mites on tomato and Ridge gourd

 

  • Rising temperatures favour mite multiplication. For the management of mites on tomato and ridge gourd, spray spiromesifen 22.9SC @ 1ml/L or fenazaquin 1.5ml/L at fortnight interval.

 

Serpentine leaf miner on cucurbits

 

  • Spray neem soap @10g/L mix with cypermethrin (1ml/L).
  • Spray neem seed powder extract 40g/litre.

 

Whiteflies on tomato

 

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

 

Brinjal shoot and fruit borer

 

  • For the management of brinjal shoot and fruit borer, spray Rynaxypyr 20 SC @ 0.3 ml/l rotate with Emamectin benzoate 5 SG @ 0.3g/liter followed by indoxacarb @ 0.75 ml/litre.

 

Mealy bugs on grapes

 

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

 

Thrips on rose

 

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

 

Mites on rose

 

  • During the period, severe incidence of mites is observed on roses grown under polyhouse conditions. Spray abamectin @ 0.5 ml/l or fenazaquin 10 EC @ 1.5ml/L at fortnight interval for their management.

 

Disease Scenario

 

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

 

Mango

  • 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%).

 

Pomegranate

 

  • After having the crop in the earlier months when the farmers are giving rest period, that time also one spray of copper based fungicides is recommended to avoid the spread of bacterial blight that can increase after summer showers.

 

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.

 

Nursery/ seedlings

 

  • In nursery the preventive spray with neem soap or neem oil is recommended to avoid the virus vectors that transmit the virus disease. One spray of systemic insecticide also will help.

 

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 20.04.2017

 

 

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