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CROP WEATHER SITUATION

METEOROLOGICAL DATA OF

ICAR-INDIAN INSTITUTE OF HORTICULTURAL RESEARCH

HESSARAGHATTA LAKE P.O., BANGALORE – 560 089

 

 

Period: 1st to 15th May, 2019

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 1.30PM

May

1st to 15th,

2019

34.8

21.9

77.3

44.1

7.02

5.32

41.9

(32.3)

 

(20.6)

(75.5)

(48.1)

(4.7)

(2.8)

(65.9)

 

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

 

Fortnight from 1st to 15th May, 2019

During the first fortnight of the month i.e., from May 1st to 15th, 2019, the average maximum temperature was lower by 0.50C and minimum temperature were higher by 1.10C respectively, as compared to the previous fortnight. The average maximum temperature and minimum temperature were lower by 1.70C 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 afternoon were higher by 6% and 5.7% respectively, as compared to the previous fortnight. There was 41.9mm rainfall during the fortnight.

Crop weather situation

The meteorological data for the first fortnight shows very dry spell with higher temperatures, lower rainfall, high wind speed and higher evaporation rate compared to the average value of previous 5 years. For standing crops like banana, supplemental irrigation may be given to make plantations to cope up with high temperatures. The less rain fall may be good for the quality of mango. In acidic soils liming may be done and incorporated into the soil. During the period, Wilt severe in pomegranate was noticed. Suitable for the cultivation of tropical species like Calocybe indica, Macrocybe crassa, Volvariella species. Hypsizygus ulmarius could be grown in evaporative cooling chambers with reduce bio efficiency.

 

Incidence of pests and diseases

Under the prevailing weather conditions, the following pests were observed in Bangalore on various horticultural crops during first fortnight of May, 2019. Pest management options are mentioned below.

 

Fruit Crops

Mango fruit fly

As the fruits had attained maturity stage, incidence of fruit fly is expected.

Install methyl eugenol traps @ 6 /acre. Traps can be procured from IIHR or KVKs or firms licensed to manufacture IIHR traps.

Collection and destruction of fallen fruits

Bait splash on tree trunks with 10% jaggery solution mixed with deltamethrin

Community approach at village level is recommended for the effective management of this pest

Incidence of leaf hoppers is noticed in mango inflorescence. Spraying of imidachloprid 0.5

Guava

Incidence of fruit fly is noticed. Setting up of para pheromone traps (methyl eugenol traps) @ 06/acre is recommended.

 

Grape thrips

On newly pruned grapes, thrips infestation on leaves is expected.

Spray Metarhizium    anisopliae formulation @ 2ml/L two times at weekly interval or fipronil 5SC @ 1.5 ml/L twice at fortnightly interval.

 

Custard Apple:

Incidence of fruit fly is noticed. Setting up of para pheromone traps (methyl eugenol traps) @ 06/acre is recommended.

 

 

Vegetable Crops

 

Bhendi /Okra:

Incidence of aphids and leaf hoppers is noticed, spraying with the thiochloprid @ 0.4 ml/l is recommended

 

Drum Stick:

Incidence of leaf eating caterpillar is noticed and spraying with lambda cyhalothrin (0.003%)/ is recommended.

 

Brinjal shoot and fruit borer

Release of Trichogramma chilonis @ 75,000 per week (for four weeks), if the incidence is moderate.

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If the incidence is very severe, 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 14.5 SC @ 0.75 ml/litre.

Tomato:

Incidence of Tutaabsolutais noticed under polyhouse conditions.Spray spinosad 45 SC @ 0.25 ml/l

Mites on tomato and Ridge gourd

Rising temperatures favour mite multiplication. For the management of mites, spray spiromesifen 22.9SC @ 0.5ml/L or fenazaquin 10 EC @ 1.5ml/L at fortnight interval.

Bitter gourd:

Incidence of aphids is noticed and spraying of thiamethoxam 0.3gm/l is recommended.

 

Cucumber:

Incidence of aphids and leaf hoppers is noticed, spraying with the thiochloprid @ 0.4 ml/l is recommended.

 

 

Gerbera:

Under polyhouse conditions thrips incidence is more. Spray [email protected]/l.

 

Capsicum:

Under polyhouse conditions thrips incidence is more. Spraying of the thiochloprid @ 0.4 ml/l is recommended.

 

Rose:

Thrips incidence is noticed on rose under polyhouse condition.  Spray Fipronil 5 SC @ 1.5 ml/l. If the problem persists after one week also, sprayspinosad 45 SC @ 0.25 ml/l.

 

*Safe waiting periods are to be followed as per the label claims

 

Disease Scenario

Disease forecast based on the weather data for first fortnight of May 2019

 

Fruit crops

 

Mango     

Anthracnose (C. gloeosporioides) and stem end rot  (L. theobromae) occur in mango fruits during ripening. Pre-harvest sprays with Carbendazim (0.1%) or Thiophanate methyl (0.1%) followed by post-harvest treatments with Hot water (52oC) for ten minutes may be followed. Care should be taken that at the time of spraying there should be minimum of

15-20 day time is there before harvest.

Grape      

Anthracnose: spraying with Propineb (0.2%)/ Chlorothalonil (0.2%)/Carbendazim (0.1%)/ Thiophanate methyl (0.1%) are effective along with sticker @ 0.5 ml/ l.

 

Pomegranate       

Nodal Blight needs further attention due to the intermittent summer showers. Application of COC (0.2%) + Streptocycline (300 ppm) /l along with the sticker @ 0.5ml/l should be applied at the interval of 15 – 20 days.

 

Banana:

Low incidence of Sigatoka (Mycospheralla sp) and other leaf spots needs attention. The disease can be managed by the application of with Carbendazim (0.1%) or Thiophanate methyl (0.1%)whereas crown rot, anthracnose and Macrophoma fruit spot disease (Specially on var. Grand Naine) could be controlled by the pre-harvest sprays involving Carbendazim (0.1%) or Thiophanate methyl (0.1%), besides post-harvest dip in Chlorine water (300 ppm) for 10 minutes.

Papaya

Infection of Anthracnose (C. gloeosporioides), Black spot (Asperisporium caricae) may further increase. Application of Chlorothalonil (0.2%)  Carbendazim (0.1%)/ Thiophanate methyl (0.1%)/ Hexaconazole (0.1%) along with the sticker @ 0.5ml/l with good coverage of the lower surface of the foliage is recommended.