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IIHR weather report

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Period: 16th to 31st May, 2019

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



Temperature (0C)

Relative Humidity (%)





Wind speed



Total Rainfall







at 7.30AM

Average at 1.30PM


16th to 31st ,2019















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

Fortnight from 16th to 31st May, 2019

During the Second fortnight of the month i.e., from May 16th to 31st, 2019, the average maximum temperature and minimum temperature were lower by 0.9°C and 0.4°C, respectively, as compared to the previous fortnight. The average maximum temperature and minimum temperature were higher by 0.80C and 0.50C, 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 2.8% and 6.7% respectively, as compared to the previous fortnight. There was 111.6mm rainfall during the fortnight.

Crop weather situation

When compare to previous fortnight, the average maximum temperature has increased to the tune of 0.89°C and the average minimum temperature has decreased 0.37°C, respectively, and evaporation rate and wind speed decreased and RH increased. The average maximum and the average minimum temperatures during this period were slightly higher than the averages for the last five years. The diurnal temperature difference has also slightly increased and rainfall, evaporation rate and wind speed were higher during the period when compared to the average corresponding values of last five years. the weather conditions of second fortnight of May 2019 were highly suitable for the cultivation of Calocybe indica (Milky mushroom) and Macrocybe gigantea. Oyster mushroom (Pleurotus spp.) could be grown under evaporative cooling system under the shade.

Incidence of pests and diseases

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

I. Fruit Crops:

Mango stem borer

This period coincides with the emergence of adult beetles of trunk borer, Batocera rufomaculata. Plug active holes (can be diagnosed with the presence of fresh hewed wood material and excreta) with cotton dipped in dichlorovos @ 5ml/L and close with mud. Affected tree trunks can be wrapped with nylon mesh to trap the emerging beetles

II. Vegetable crops:

Fruit fly on cucurbits

For the management of fruit fly (Bactrocera cucurbitae) on cucurbits, following integrated approach may be followed. Installing cue lure traps @ 10 traps/acre + Sanitation (complete destruction of infested fruits at each harvest) + Bait spray (Deltamethrin 0.1 % + jaggery @ 10g/L) at 10 days interval from the date of flowering.

Chilli Thrips

Spray fipronil 5SC  (1.5 ml/l) or imidacloprid 200 SL (0.3 ml/l) alternately at fortnightly interval

Root-knot nematode in tomato

Raise healthy seedlings on soil applied with FYM or vermicompost @5 tons/ha enriched with Trichoderma harzianum @ 2kg + Paecilomyces lilacinus @ 2kg + Pseudomonas fluorescens @2kg /ton of FYM.

In standing crop, apply neem cake enriched with above biopesticides @ 50g/ m2. This can also be mixed with water and applied as soil drench @ 2l/m2. The same can be thoroughly filtered and sent along with drip or sprayed.

III. Ornamental crops:

Whitefly on Gerbera (polyhouse)

Spray diafenthiuran  @ 1 g/l followed by dinetofuran 1g/litre

Install yellow sticky traps coated with adhesive or sticky glue at crop canopy level for monitoring adult whitefly population

Rose Thrips

Spray imidacloprid 17.8 ml/l or dimethoate 30 EC @ 2ml/l with pongamia oil 0.5%.

Apply Fipronil 5 SC @ 1.5 ml/l in case of severe infestations.

Drench the soil with Chlorpyrifos 20 EC @ 5ml/l for killing pupae in the soil.

Midge on crossandra

Incidence of midge is increasing on crossandra. For its management spray imidacloprid @ 0.5 ml/l.

Disease Scenario

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

I. Fruit crops


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.


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.


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 pre-monsoon showers, blight incidence will increase.  Application of COC (0.2%) + bononopal 0.5g/l along with the sticker @ 0.5ml/l should be applied at the interval of 15 – 20 days. Preventive sprays of plant health promoters like Arka Microbial consortium or Arka Actinoplus would help in better plant growth and there by induced resistance.


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 salt water (300 ppm) for 10 minutes


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. 


Canker (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


II. Vegetable Crops


To 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. 


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


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%) lO-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%), Acephate (0.15%) or Hostothion (0.1 %) at fortnightly intervals after transplanting till flowering stage to control the vectors