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CROP WEATHER SITUATION

METEOROLOGICAL DATA OF

ICAR-INDIAN INSTITUTE OF HORTICULTURAL RESEARCH

HESSARAGHATTA LAKE P.O., BANGALORE – 560 089

CROP WEATHER SITUATION

METEOROLOGICAL DATA OF

ICAR-INDIAN INSTITUTE OF HORTICULTURAL RESEARCH

HESSARAGHATTA LAKE P.O., BANGALORE – 560 089

 

Period: 1st to 15th October, 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

October

1st to 15th,

2019

29.9

19.6

89.3

65.9

5.2

2.85

219.8

(29.6)

(20.5)

(79.8)

( 55.4)

(3.4)

(2.5)

(120.5)

 

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

Fortnight from 1st to 15th October, 2019

During the first fortnight of the month i.e., from October 1st to 15th, 2019, the average maximum temperature was higher by 0.90C and minimum temperature was lower by 0.80C respectively, as compared to the previous fortnight. The average maximum temperature was higher by 1.20C, whereas the minimum temperature remains the same, 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 lower by 1.3% and 4.5% respectively, as compared to the previous fortnight. There was 219.8mm rainfall during the fortnight.

Crop weather situation

When compared to the last fortnight, the average maximum temperature had increased to the extent of 1.0°C and the minimum temperature decreased 0.8°C, respectively. The relative humidity and wind speed decreased, whereas evaporation rate increased. The total rainfall (220 mm) during this period had increased tremendously. Though evaporation rate was high, because of sufficient rainfall no need of supplemental irrigation during this period, but in the upcoming days if there will not be any rainfall, supplemental irrigation is required for crop cultivation. Weather during the fortnight was suitable for the cultivation of Pleurotus species. The sporophore induction in Calocybe and Macrocybe species was delayed by 2-3 days due to low night temperatures. The weather condition was conducive for Spawn running of Lentinula species and Pleurotus eryngi but sporophore induction required additional cooling. 

Incidence of pests and diseases

Under the prevailing weather conditions, the following pests are expected in Bangalore on various horticultural crops.  Their management options are mentioned below.

Fruit Crops

Mango shoot borer

Clip and destroy affected shoots.

Spray indoxacarb 14.5 [email protected] 0.75ml/l or Quinalphos 25 EC @ 2ml/l at the time of emergence of new flush. This will also take care of leaf eating weevil, Rhynchaenus mangiferae.

Webber and ash weevil on Mango

Incidence of webber and ash weevil become serious on new leaves.  Remove webbed leaves wherever possible and burn them. Spray quinalphos [email protected] 2 ml/l or lambda cyhalothrin 5EC @ 1ml /l for their management.

Pomegranate

Fruit sucking moth

Wherever matured fruits are there fruit sucking moth damage is expected. Netting the orchards is recommended.

Grapes

Thrips, Scirtothrips dorsalis is expected to occur on leaves of newly pruned Bangalore Blue. Spray fipronil 5SC @ 1.5ml/L or Metarhizium formulations.

Vegetable Crops

Fruit fly on cucurbits

For the management of fruit fly on cucurbits, following integrated approach may be followed. Deployment of 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.

Tobacco caterpillar on Tomato

For the management of this pest, spray indoxacarb @ 0.75 ml/L or thiodicarb @ 1 g/L.

Leaf hopper on okra/Bhendi

Incidence of jassids is observed on okra.  Spray imidacloprid 17.8 SL @ 0.3 ml/l, if the crop is at pre-flowering stage. Otherwise, spray neem or pongamia soaps @ 0.5 %, thoroughly covering lower surface of leaves.

Floriculture

Thrips on rose

Incidence of rose thrips was observed more under polyhouse conditions. Spray acepthate 70SP @ 1 g/l or imidacloprid 17.8 SL @ 0.5 ml/l for its management.

 

Disease Scenario

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

Fruit crops

Grapes   

Rust might continue to be noticed in grape vine orchards (var Bangalore Blue) and could be managed by the treatment with Chlorothalonil (0.2%) or Bitertanol (0.2%) or Dinocap (0.3%) + Mancozeb (2%) along with sticker @ 0.5 ml/ L.

Mango

Sooty mould should be 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%).

Anthracnose spots may increase on foliage. Application of Chlorothalonil (0.2%) or Thiophanate methyl (0.2%) or Carbendazim (0.1%) along with sticker (@ 0.5 ml / L) is recommended for the disease management.

Banana

Intensity of Sigatoka leaf spot (Mycospheralla sp.), crown rot (  Fusarium moniliforme & Botryodiplodia  theobromae) and anthracnose (Colletotrichum musae ) of fruits may be increased compared to last fortnight. Sigatoka could be managed by spraying Carbendazim (0.1%) or Thiophanate methyl (0.1%) or Tridemorph (0.1%)/ whereas crown rot and anthracnose 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.

Macrophoma spots may appear on the fruits of Robusta varieties of banana. Application of Carbendazim (0.1%) or Thiophanate methyl (0.1%) is recommended for managing the same.

Pomegranate

Intensity of leaf and fruit spot disease caused by Pseudocercospora punicae and anthracnose of fruit and leaf (C. gloeosporioides) may remain moderate. 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. This will avoid spread of scab disease also.  Regular spray of copper oxychloride (0.2%) or Bordeaux mixture (1%) along with streptocycline 0.5g/l is to be continued to avoid spread of nodal blight.

Vegetable Crops

Leaf blight of tomato and potato by Phytophthora infestans

Since the rain fall was heavy during September there is higher spread of late blight. If blight has not started, preventive spray of chlorothalonil or copper oxy chloride at 0.2% is recommended.  In case of severe infection, spray of fenamidone + dithane M 45 (Sectin) at 0.1% is recommended.

Powdery mildew in solanaceous vegetable crops

 Spray of wettable sulphur or dithane M 45 after the appearance of the powdery mildew symptoms. In case of severe infection hexaconazole at 0.1% is recommended.

Ornamental crops

Incidence of rose powdery mildew is expected to increase.  In case of severe infection hexaconazole 0.1% or azoxystrobin 0.1% will reduce the disease spread.