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IIHR weather report

Period: 1st to 15th May, 2017

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

CROP WEATHER SITUATION

METEOROLOGICAL DATA OF

ICAR-INDIAN INSTITUTE OF HORTICULTURAL RESEARCH

 HESSARAGHATTA, BANGALORE – 560 089

 

 

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

May

16th to 31st,

2017

31.6

21.5

86.3

52.0

4.2

-

176.4

(31.5)

 

(20.1)

(76.1)

    (45.1)

    (5.6)

(5.1)

 

(97.1)

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

 

Fortnight from 16th to 31st May, 2017

During the second fortnight of the month i.e., from May 16th to 31st, 2017, the average maximum temperature was lower by 2.20C and minimum temperature was higher by 0.80C respectively, as compared to the previous fortnight. The average maximum and minimum temperatures were lower by 1.20C and 0.30C 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 higher by 15% and 7.9% respectively, as compared to the previous fortnight. There was 176.4 mm rainfall during the fortnight.

Crop weather situation

The fortnight was a rainy fortnight with six rainy days and received two folds more rains than previous average. Hence the soil is suitable for any cultivation. But farmers should be careful in not disturbing the soil if it is too wet. During this period, farmers must apply organic manures along with Arka Microbial Consortiums to all horticultural crops. Further vegetable farmers may take up spray of vegetable special for better results. Due to heavy rain, lot of damage was observed in Jamun germplasm collection.  Flower, fruit drop and pest infestation was also found to be severe. Due to cloudy weather and rains incidence, downy mildew was observed in grapes which was kept under control by suitable prophylactic sprays. The weather data of the fortnight was suitable for the cultivation of Oyster Mushroom (Pleurotus spp.), Paddy straw mushroom (Volvariella spp) and Milky mushroom (Calocybe indica).

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 fruit fly (Bactrocera dorsalis)

As the mango fruits are in mature stage, fruit fly incidence is expected to increase across the varieties.  For its management following management measures are suggested:

Installation of methyl eugenol traps @ 6 /acre. Traps can be procured from IIHR, Bangalore or KVKs.

Collection and destruction of fallen fruits.

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

Brinjal shoot and fruit borer (Leucinodes orbonalis)

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

Install pheromones traps in the field

Spray rynaxypyr @ 0.3 ml/l rotate with emamectin benzoate 0.3g/liter followed by indoxacarb @ 0.75 ml/litre.

Two spotted spider mite (Tetranychus urticae) on rose

Spray abametin @ 0.5 ml/l under polyhouse conditions for its management.

Thrips (Scirtothrips dorsalis) on chilli

Incidence of thrips may increase on chilli and capsicum. For its management, spray fipronil @ 1.5 ml/l alternating with imidacloprid @ 0.5 ml/l at fortnightly interval if the crop is at early stage of infestation.  Addition of 2 ml of neem oil or pongamia oil per every liter of insecticide spray solution enhances the efficacy of the chemicals against the pest. 

Disease Scenario

Disease forecast based on weather parameters during the second fortnight of May, 2017.

Fruit crops

Mango

vAnthracnose (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 is recommended.

Grape

Grapevines should be continued to be protected against the infection of (i) downy mildew: by the application of 0.4g Dimethomorph  + 2.00 g Mancozeb /l or Metalyxl + Mancozeb (0.2%)/ Al Fosetyl (0.2%) along with sticker @ 0.5 ml/ l. Lower surface of the leaves on the vines to be sprayed properly (ii) 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

Intensity of leaf and fruit spot disease caused by Pseudocercospora punicae and anthracnose of fruit and leaf (C. gloeosporioides) may increase further. Application of Chlorothalonil (0.2%) /Antracol (0.2%)/ Carbendazim (0.1%)/ Thiophanate methyl (0.1%)/ Hexaconazole (0.1%) along with the sticker @ 0.5ml/l is effective for the disease control.

Nodal Blight needs further attention. With the early onset of rains blight incidence will increase.  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%) or Tridemorph (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. 

Guava

vCanker (Pestalotiopsis psidi) in greenish immature guava fruits and styler end rot (Phomopsis psidi) and anthracnose (C. gloeosporioides) should be taken acre. For the disease management application of Zineb (0.3%) or Ziride (0.4%) followed with Carbendazim (0.1%)/ Thiophanate methyl (0.1%)/ along with sticker (0.5 ml /l) should be followed.

 

Vegetable Crops

Tomato

vTo prevent the early leaf blight disease free seedlings are to be used.  Seed treatment with captan or thiram (3g per kg of seeds) or seedling dip with copper oxy chloride (0.3%) also protects plants from various soil borne pathogens. It is the time for the protective sprays of contact fungicides like mancozeb, copper oxychloride or chlorothalanil on tomato to avoid early leaf blight.    In case of serious spread due to rain splash follow up spray with propineb (0.2%) or meitiram (0.2%) or pyraclostrobin + metiram (0.2%) at fortnightly interval. 

Onion

To avoid the purple blotch and Stemphyllum leaf blight application of fungicides such as Chlorothalonil (0.2 %) or Propineb (0.2 %) or Mancozeb (0.2%) at fortnightly intervals from onset of the disease will be useful

Cucurbits

To avoid the spread of downy mildew spraying Chlorothalonil (0.2%)or Mancozeb(0.2%) or Metalaxyl -Mancozeb(0.2%) or Fosetyl-AI (0.2%) or Cymoxanil- mancozeb(0.2%) l0-day intervals from onset of the disease.

 

Viral diseases in tomato and chilli

To avoid the spread of viral diseases spraying insecticides like Monocrotophos (0.15%), Hostothion (0.1 %) at fortnightly intervals after transplanting till flowering stage.


Updated on 14.06.2017

 

 

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