CROP WEATHER SITUATION
METEOROLOGICAL DATA OF
ICAR-INDIAN INSTITUTE OF HORTICULTURAL RESEARCH
HESSARAGHATTA LAKE P.O., BANGALORE – 560 089
Period: 1st to 15th October, 2020
Latitude : 13071 N Longitude : 720291E 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 |
||||
|
October 1 to 15, 2020 |
28.1 |
19.9 |
89.6 |
71.7 |
3.1 |
5.15 |
30.6 |
|
(29.7) |
(20.1) |
(83.9) |
(59.1) |
(3.7) |
(2.4) |
(132.3) |
|
* Figures in the parentheses indicate the average values during the corresponding period for the previous 5 years
Fortnight from 1st to 15th October, 2020
During the first fortnight of the month i.e., from October 1st to 15th, 2020, the average maximum temperature increased by 0.90C and minimum temperature decreased by 0.10C as compared to previous fortnight. The average maximum temperature increased by 1.60C and minimum temperature decreased by 0.30C, when compared to the average values of the corresponding period for the previous five years. The percent relative humidity decreased by 0.1% in morning and 3.9% during afternoon as compared to the previous fortnight. There was 30.6 mm rainfall during the fortnight.
Crop weather situation
October pruning and earthing up operations in the standing crops may be taken up. Field preparation, fertilizer application and sowing of rabi vegetables and inter culture operations in standing crops may also be taken up. Green manures raised in the month of July/August have to be incorporated in to the soil in between the rows of tree crops.
Incidence of pests and diseases
Under the prevailing weather situation, the following pests are expected under Bangalore conditions on various horticultural crops. Various management options for their management are as below.
Fruit Crops
Mango
Mango shoot borer
Clip and destroy affected shoots.
Spray indoxacarb 14.5 SC@ 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
Incidence of webber and ash weevil become serious on new leaves. Remove webbed leaves wherever possible and burn them. Spray quinalphos 25EC@ 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 ranxypyr 18.5 SC @ 0.3ml/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 @ 1 %, thoroughly covering lower surface of leaves.
Flower Crops
Thrips on rose
Incidence of rose thrips was observed more under polyhouse conditions. Spray acephate 75 SP @ 1 g/l or imidacloprid 17.8 SL @ 0.5 ml/l for its management.
Disease Scenario
Disease forecast based on weather parameters during the first fortnight of October, 2020.
Fruit Crops
Grape
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 & Botryodiplodiatheobromae) and anthracnose (Colletotrichum musae) of fruits may be increased compared to last fortnight. Sigatoka could be managed by spraying propiconazole (0.1%) whereas crown rot and anthracnose could be controlled by the post-harvest dip in Chlorine water (300 ppm) for 10 minutes.
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%) 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.
Vegetables Crops
Solanaceous vegetables
Powdery mildew
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.
Tomato and potato
Leaf blight by Phytophthora infestans
Spread of late blight is expected to continue. 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.
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.
