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IIHR weather report

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CROP WEATHER SITUATION

METEOROLOGICAL DATA OF

ICAR-INDIAN INSTITUTE OF HORTICULTURAL RESEARCH

HESSARAGHATTA LAKE P.O., BANGALORE – 560 089

 

 

Period: 16th to 31st March, 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

March

16th to 31st,

2019

35.1

18.2

67.0

28.0

7.9

4.7

0.0

(33.8)

 

(19.7)

(70.4)

(43.1)

(6.1)

(3.2)

(10.8)

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

 

Fortnight from 16th to 31st March, 2019

During the second fortnight of the month i.e., from March 16th to 31st, 2019, the average maximum and minimum temperatures were higher by 1.00C and 0.60C respectively, as compared to the previous fortnight. The average maximum and minimum temperatures were higher by 2.00C and 0.10C, respectively, as compared to the average values of the corresponding period for the previous five years. The percent relative humidity during morning was higher by 4.2%, whereas during afternoon it was lower by 2.6% respectively, as compared to the previous fortnight. There was no rainfall during the fortnight.

Crop weather situation

When compare to previous fortnight, the average maximum temperature and minimum temperature has increased to the tune of 1°C and 0.6 °C, respectively, and evaporation and wind speed were also increased and there was reduction in RH.  The average maximum temperature during this period was higher and the average minimum temperature was lesser than the average for the last five years. The diurnal temperature difference has also increased and the evaporation was higher with no rainfall during the above period. Because of high evaporation rate and low rainfall supplemental irrigation may be given. The severe dry weather with higher diurnal variation in temperature coupled with lower humidity resulted in more fruit drop in crops like mango, guava and papaya.  Incidence of scales was also noticed in crops like custard apple. The weather condition of second fortnight of March was suitable for the cultivation of Tropical species like Calocybe indica, Volvariella volvaceae. The new species Macrocybe crassa too showed better fructification.

 

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

Incidence of fruit flies is noticed in most of the varieties. Setting up of para pheromone traps (methyl eugenol traps) @ 06/acre is recommended.

Guava

Incidence of fruit fly is noticed. Setting up of para pheromone traps (methyl eugenol traps) @ 06/acre is recommended.

Sapota

Incidence of seed borer is noticed. Spraying with the DDVP 1 ml/l is recommended.

Custard Apple

Incidence of fruit fly is noticed. Setting up of para pheromone traps (methyl eugenol traps) @ 06/acre is recommended.

Vegetable Crops

Bhendi/Okra

Incidence of aphids, leaf hoppers and mits is noticed. For management aphids and leaf hoppers spraying with the thiochloprid @ 0.4 ml/l is recommended. For management of mids spraying with the spiromesifin 1 ml/l is recommended.

Drum Stick

Incidence of leaf eating caterpillar is noticed and spraying with lambda cyhalothrin (0.003%)/ is recommended.

Brinjal

The incidence of brinjal shoot and fruit borer can be expected. Spraying of [email protected] ml/l or [email protected] ml/l is recommended.

Cabbage

Incidence of diamond back moth is noticed. Sprayingwith the diafenthiuran 0.5gm/l) is recommended.

Tomato

Incidence of Tuta absoluta is noticed under polyhouse conditions.  Spray spinosad 45 SC @ 0.25 ml/l.

Bitter gourd

Incidence of aphids is noticed and spraying of thiamethoxam 0.3gm/l is recommended.

Cucumber

Incidence of aphids and leaf hoppers is noticed, spraying with the thiochloprid @ 0.4 ml/l is recommended.

Capsicum

Under polyhouse conditions thrips incidence is more. Spraying ofthe thiochloprid @ 0.4 ml/l is recommended.

Floriculture

Gerbera

Under polyhouse conditions thrips incidence is more. Spray [email protected]/l.

Rose

Thrips incidence is noticed on rose under polyhouse condition.  Spray Fipronil 5 SC @ 1.5 ml/l. If the problem persists after one week also, sprayspinosad 45 SC @ 0.25 ml/l. Drenching the soil with the chloropyriphos @ 2 ml/l is recommended

*Safe waiting periods are to be followed as per the label claims

Disease Scenario

Disease forecast based on weather parameters during the second fortnight of March, 2019.

 

Fruit Crops

Mango:

Anthracnose spots might further increase on foliage. Application of Mancozeb + Dinocap (0.3%) or Tridemorph (0.1%) or Hexaconazole (0.1%) is recommended for the disease management. Severity of Anthracnose spots might increase. Application of Difenconazole (0.05%) or Thiophanate methyl (0.1%) is recommended along with sticker @ 0.5 ml/ l.

Sooty mould should be still 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%).

Grape:

Anthracnose infection may be noticed. For anthracnose application of Difenoconazole (0.05%)/ Thiophanate methyl (0.1%) / Carbendzim + Mancozeb (0.2%) /Bitertanol (0.2%)  along with sticker @ 0.5 ml/ l is recommended for the management of disease.

Vegetables:

Anthacnose in vegetables will increase especially in chillies.  For anthracnose application of Difenoconazole (0.05%)/ Thiophanate methyl (0.1%),/ Carbendzim + Mancozeb (0.2%) /Bitertanol (0.2%) along with sticker 0.5ml/l will be effective.

Virus diseases:

Change in weather especially low humidity with increase in temperature favours sucking pests which are vectors of many virus diseases.  Seed treatment with imidacloprid or spray of acephate (0.2%) will be effective in controlling vector population.