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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 February, 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

February

1st to 15th,

2017

25.9

14.9

53.9

31.0

5.2

2.2

0.0

(29.1)

 

(16.0)

     (73.5)

    (47.2)

    (4.5)

  (4.62)

 

(0.0)

 

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

 

Fortnight from 1st to 15th February, 2017

 

During the first fortnight of the month i.e., from February 1st to 15th, 2017, the average maximum temperature and minimum temperature were lower by 2.70C and 1.40C respectively, as compared to the previous fortnight. The average maximum temperature and minimum temperature were higher by 1.10C and 0.70C respectively, as compared to the average values of the corresponding period for the previous five years. The percent relative humidity during morning and evening were lower by 18.7%, and 5.9% respectively, as compared to the previous fortnight. There was no rainfall during the fortnight.

 

Crop weather situation

 

Very dry weather conditions prevailed during last fortnight. Frequent supplementary irrigation are very much required for late rabi vegetables and other fruit crops which are in the field. Mulching may also be provided to prevent evaporation losses. Weather during the fortnight was suitable for the cultivation of Oyster Mushroom (Pleurotus spp.) and Shiitake mushroom (Lentinula edodes) with additional humidity requirement. Milky mushroom was slow to grow both during spawn running and cropping.

 

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.

 

Hoppers on mango

 

  • Incidence of hoppers is expected on mango. Spray Azadirachtin 10000 ppm @ 3 ml/L, if the hopper population is low to moderate. If the number exceeds 4 per panicle spray with imidacloprid 200 SL @ 0.3 ml/l or lambda cyhalothrin 5 EC @ 0.5 ml/l at early panicle emergence. This will also take care of thrips. Addition of sticker is essential. Avoid spraying on full bloom to protect pollinators.
  • For organic orchards, application of entomopathogen, Metarhizium anisopliae formulation @ 5ml/L is recommended.

 

Flower webbers / inflorescence caterpillars on mango

 

  • Besides hoppers, inflorescence caterpillars which web the flowers and feed inside are potential pests on mango during January. Application of lambda cyhalothrin 5EC @ 0.5ml/L or cypermethrin 25 EC @1ml/L are useful to control the pest.

 

Banana skipper

 

  • Skipper butterfly is becoming is serious pest on banana. Larva rolls the leaves and feeds by remaining inside. Affected leaves to be mechanically removed and destroyed. In case of severe infestation, spraying of quinolphos @ 2ml/L  or chlorpyriphos @c 2.5ml/L is advised.

 

Tomato fruit borer

 

  • With the prevailing weather, incidence of tomato fruit borer may increase on tomato.  For its management, spray HaNPV @ 250 LE/ha during evening hours or spray indoxacarb 14.5 SC @ 0.75ml/l, if the incidence is very high. Proper waiting periods are to be followed before harvest of tomatoes.

 

Midge on chillies

 

  • Severe incidence of midges is observed on chilli which causes maximum damage at flowering stage.  Spray thiamethoxam 25 WG @ 0.3 g/l for their management.

 

Aphids on cucurbits

 

  • Aphid infestation may increase on different cucurbits. Spray imidacloprid 200 SL @ 0.5 ml/l or thiamethoxam 25 WG @ 0.3 g/l for their management.

 

Aphids on Beans and rose

 

  • Aphids incidence is observed on beans and rose. Thoroughly spray neem soap or Pongamia soap (1 %) or pulverised neem seed powder extract (NSPE) 4 % for their management. 

 

Thrips on rose

 

  • For the management of thrips on rose, spray fipronil 5 SC @ 1.5 ml/litre or imidacloprid 200 SL @ 0.5 ml/l.

 

Mites on tomato

 

  • Incidence of mites is observed and may increase on tomato.     For their management spray spiromesfin 22.9 SC @ 1 ml/l or fenazaquin 10 EC@ 3 g/L.

 

Mites on Rose

 

  • During the period, incidence of mites is observed heavily on roses grown under polyhouse conditions. Spray spiromesfin 22.9 SC @ 1 ml/l for their management.

 

Disease Scenario

 

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

 

Vegetables

 

  • Powdery mildew incidence will be high in all vegetables (solaceous and cucurbitaceous).  If temperature is not high wettable sulphur can be given. If temperature increases spraying of wettable sulphur should be avoided. Hexaconazole at 0.1% along with sticker 0.5ml/ l will be effective in controlling the powdery mildews in 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.

 

Ornamentals

 

  • Powdery mildews in rose and gerbera. Spraying azoxystrobin at 0.05% along with sticker 0.5ml/l will help in reducing powdery mildew spread under protected cultivation.   In not spread extensively tebuconazole or hexaconazole at 0.1% with sticker also will help.
  • Chrysanthemum rust: specifically in the variety locally named as marigold chrysanthemum it is severe. Spray of chlorothalonil at 0.2% at 15 days interval will reduce the incidence.  In severe cases it can be alternated with propiconazole at 0.1%.

 

Virus diseases

 

  • Change in weather especially 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 21.02.2017

 

 

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