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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 August, 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

August

1st to 15th,

2019

27.7

20.8

87.4

72.1

4.34

9.99

54.1

(28.6)

 

(20.8)

(77.4)

(59.5)

(3.4)

(5.0)

(61.0)

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

Fortnight from 1st to 15th August, 2019

During the first fortnight of the month i.e., from August 1st to 15th, 2019, the average maximum and minimum temperatures were lower by 1.00C and 0.10C respectively, as compared to the previous fortnight. The average maximum temperature was lower by 0.50C and minimum temperature was higher by 0.10C, 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 1.8% and 4.6% respectively, as compared to the previous fortnight. There was 54.1mm rainfall during the fortnight.

Crop weather situation

During the first fortnight of August, 2019, average maximum temperature was lower, relative humidity was higher, average rainfall received was lower and wind speed and evaporation rate were higher compared to the average values of previous 5 years. If soil condition is good, intercultural operations may be taken up. Required dose of fertilizers and manures may be given as per the recommendations. The climate during the fortnight was very suitable for the cultivation of all Pleurotus species, Agrocybe species, Lentinula species and Hericium species. Cultivation of Calocybe and Macrocybe species could be done with longer duration and lesser bio efficiency.

 

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

Leaf Webber on mango

Remove and destroy the webbed portions wherever they are accessible

For the management of this pest prune the affected shoots and spray lambda cyhalothrin 5EC @ 1ml/l

Mango shoot borer

Clip and destroy affected shoots

Spray lambda cyhalothrin 5EC @ 1ml/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

Fruit fly on cucurbits

For the management of fruit fly on cucurbits, following integrated approach may be followed. Deployment of cue lure traps @ 15 traps/acre + Sanitation (complete destruction of infested fruits at each harvest) + Bait spray (deltamethrin 1 ml + jaggery @ 10g/L) at 10 day’s interval from the date of flowering

Bait Splash of 40/ acre (150g jaggery + 500mlwater + 5ml deltamethrin)

Tomato moth

Install tuta pheromone traps for monitoring of the adults @ 4-6 traps/acre

Spray indoxacarb 14.5 SC @ 0.75 ml/litre or spinosad 45 SC @ 0.3ml/l

Mites on tomato

For the management of mites, spray wettable sulphur @ 3 g/l or propargite 57 EC @ 1.25 ml/l or fenzaquin 10EC @ 1.5ml/litre

Chilli Thrips

Spray fipronil 5 SC (1.5 ml/l) or Difenthuran 50WP @ 1g/litre or thiacloprid 240 SC @ 0.5 ml/l alternately at fortnightly interval

Root-knot nematode in tomato

 Raise healthy transplants 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

Rose Thrips

Spray imidacloprid 17.8 SL @ 0.5ml/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

Mites on rose

For the management of mites, spray milbemectin @ 1 ml/l

Midge on crossandra

Under the prevailing conditions, incidence of midge increases on crossandra.  For its management spray imidacloprid @ 0.5 ml/l

Whitefly on Gerbera (polyhouses)

Spray diafenthiuran 50WP @ 1 g/l followed by dinetofuran 20SG @1g/litre

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

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

Disease Scenario

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

 

Fruit Crops

Grape

Downy mildew

Protection against the infection of downy mildew by the application of 0.8 g Dimethomorph + 2.00 g Macozeb /L or Metalyxl + Mancozeb (0.2%)/ Al Fosetyl (0.2%).

Rust

Rust needs to be taken care in grape vine orchards (var Bangalore Blue). It could be managed by the treatment with Chlorothalonil (0.2%) along with sticker @ 0.5 ml/ l.Lower surface of the leaves on the vines to be sprayed properly. In white varieties preventive sprays for anthracnose management with difenconazole 0.05% or thiophenate methyl 0.1%

Banana

Intensity of Sigatoka leaf spot (Mycospheralla sp) may be moderate. For controlling Sigatoka application of Chlorothalonil (0.2%) is recommended. Moderate infection of Leaf (Dieghtonella spp.), and fruit spots (Macrophoma spp.) may be noticed that could be effectively managed by the pre-harvest sprays with Zineb + Hexaconazole (0.2%) or Thiophanate methyl (0.1%).

Pomegranate

On fresh foliage and emerging flower buds infection of anthracnose might be noticed whereas Leaf and fruit spot disease caused by Puedocercospora punicae may become serious These could be managed by spraying Chlorothalonil (0.2%)/Antracol (0.2%)/ Carbendazim (0.1%)/ Thiophanate methyl (0.1%)/ Hexaconazole (0.1%) along with the sticker @ 0.5ml/l.

For bacterial blight spray of Bordeaux mixture 1% along with bronopol or streptocycline at 0.5% at 15 day’s interval will reduce the spread of the disease.

Vegetables

Because of intermittent rains spread of Phytophthora blight is expected in tomato, chilli and other crops.  For initial stages preventive spray with chlorathalonil (0.2%) and Bourdeaux mixture (1%) will help. In severe conditions where spread is faster spraying with cymoxanil + mancozeb (0.1%). 

In solanaceous (tomato, capsicum, chilli) and cucurbitaceous vegetables (pumpkin, cucumber, ridge gourd etc.) Powdery mildew may appear with cool and dry weather. Hexaconazole at 0.2% spray with 0.5ml sticker/l will reduce the spread and severity.  For Alternaria leaf spot chlorothalanil or dithane M 45 at 0.2% spray as preventive measure will reduce the disease incidence.