Weather Based Crop Advisory

IIHR WEATHER REPORT AND CROP ADVISORIES

METEOROLOGICAL DATA OF    

ICAR-INDIAN INSTITUTE OF HORTICULTURAL RESEARCH

HESSARAGHATTA LAKE P.O., BANGALORE – 560 089

Latitude : 13^o 7’ N                              Longitude: 77^o29’ E               Altitude: 890 M

Date	Temperature		Relative Humidity		Evaporation	Wind speed	Rainfall
-	oC		%		mm	km/h	mm
	Mean Max.	Mean Min.	Mean At 8.30 am	Mean At 1.30 pm
09.12.2024	28.7	18.4	95	60	3.1	0.60	0.0

 

Period: 1^st to 15^th December, 2024

Latitude : 13⁰7¹ N                              Longitude : 72⁰29¹E                          Altitude : 890 M

Fortnight	Temperature (0C)		Relative Humidity (%)		Evaporation (mm)	Wind speed (km/h)	Total Rainfall (mm) Mean Max.
	Mean Max.	Mean Min.	Mean At 7.30AM	Mean at 1.30 PM
December (1 - 15) 2024	26.29	19.33	92.27	72.73	2.77	3.51	43.10
	(26.8)	(17.1)	(86.6)	(62.7)	(2.7)	(3.6)	(27.3)

 

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

Fortnight from 1^st to 15^th December, 2024             

During the first fortnight of the month i.e., 1^st to 15^th December, 2024, the mean maximum temperature decreased by 0.48ºC and mean minimum temperature increased by 1.77ºC as compared to the previous fortnight. The mean maximum and minimum temperature decreased by 0.6^ºC and 0.6ºC respectively as compared to the mean values of the corresponding period for the previous five years. The percent relative humidity in the morning and afternoon increased by 1.67% and 6.06% respectively as compared to the previous fortnight. There was 43.10 mm rainfall reported during this fortnight.         

 Crop weather situation

Necessary drainage should be provided in the field as high rainfall was observed during the fortnight. For the rabi vegetables which have already been transplanted top dressing of N @50 kg/ha may be given. Vegetable farmers may undertake spray of vegetable special. If pollination is completed mango farmers are advised to take up spray of mango special.

 

Incidence of insect pests

Under the prevailing weather situation, following pests are expected under Bengaluru conditions on different horticultural crops. Various management options for their management are mentioned below.

     

Hoppers on mango

• Wherever flowering started, incidence of hoppers is expected to occur on mango. Spray Azadirachtin 3000 ppm @ 2 ml/l, if the hopper population is low to moderate. If the number exceeds 4 per panicle spray with imidacloprid 200 SL @ 0.25 ml/l. If blossom webber is noticed, spray lambda cyhalothrin* 5 EC @ 0.5 ml/l at early panicle emergence. Add stickers for enhancing the efficacy. Also direct the sprays to the trunks to check hibernating adults of stone weevils and hoppers.

 

Tomato fruit borer

• With the prevailing weather, incidence of tomato fruit borer may increase on tomato.  For its management, spray HaNPV @ 250 LE/ha during evening hours or spray indoxacarb 14.5 SC @ 0.5ml/l, if the incidence is very high. Proper waiting periods are to be followed before harvest of tomatoes

 

Midge on chillies

• Severe incidence of midges is observed on chilli which causes maximum damage at flowering stage.  Spray thiamethoxam 25 WG @ 0.3 g/l for their management.

 

Thrips on capsicum and chilli

• Incidence of thrips is increasing on capsicum grown under shade net/polyhouses and chilli grown under open conditions. Spray imidacloprid 200 SL @ 0.5 mL/l or fipronil 5 SC @ 1.5 ml/l.

 

Aphids on cucurbits

• Aphid infestation may increase on different cucurbits during cool weather. Spray neem soap @ 10g/liter or imidacloprid 200SL @ 0.5 ml/l for their management

 

CIBRC approved, others not in the CIBRC list are based on reports

Disclaimer: Wherever label claim not available, recommendations are made based on experimental results

 

Disease scenario

Disease scenario in relation to the weather data during first fortnight of December, 2024.

 

Vegetable crops:

 

Tomato

 

• Early blight severity increases in tomato. To manage this disease remove and destroy lower most old and diseased leaves in the morning. It should be followed by foliar sprays with mancozeb @ 2g/l or tebuconazole 50% + trifloxystrobin 25% WG @0.75g/l at fortnightly interval

Onion

• Foliar sprays with mancozeb75%WP@ 2.0 g/l followed by need based sprays with tebuconazole 50% + trifloxystrobin 25% WG @0.6g/l. Avoid sprinkler irrigation

Chilli

• Powdery mildew severity increases under prevailing weather conditions. Spray tebuconazole25% WG (1.5g/L), or tebuconazole25.9%m/m EC @1ml/L or azoxystrobin 18.2% w/w + difenoconazole 11.4% w/w SC @1ml/L, or  tebuconazole 50% + trifloxystrobin 25% WG@ 0.5g/l.

Muskmelon

• Due to prevailing dew conditions, downy mildew starts appearing in muskmelon. To manage this disease spray  zineb75%WP @2g/L or  ametoctradin + dimethomorph 20.27% w/w SC @2g/L

 

Fruit Crops

Mango 

 

• Powdery mildew requires attention. At this point of time application of wettable suphur (0.2%) along with sticker @ 0.5 ml/L is recommended. Wettable Sulphur should not be applied if the temperature is higher. Hexaconazole 5% EC @ 1ml per litre