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IIHR weather report

Period: 16st to 31st July, 2017

Latitude: 13071 N                   Longitude: 770 291E              Altitude: 890 M

CROP WEATHER SITUATION

METEOROLOGICAL DATA OF

ICAR-INDIAN INSTITUTE OF HORTICULTURAL RESEARCH

 HESSARAGHATTA, BANGALORE – 560 089

 

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

July

15st to 31st,

2017

29.92

20.1

81.7 60.5

3.7

4.5

15.5

(29.1)

(20.1)

     (76.6)

    (50.6)

    (3.8)

 (7.9)

(67.8)

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

Fortnight from 16th to 31st July, 2017

During the first fortnight of the month i.e., from July 16th to 31st, 2017, the average maximum temperature was higher by 0.80C, while minimum temperature remains the same respectively, as compared to the previous fortnight. The average maximum temperature was higher by 1.00C and minimum temperature was lower by 0.20C 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 2.5% respectively, as compared to the previous fortnight. There was 15.5mm rainfall during the fortnight.

Crop weather situation

As there was deficit rainfall during last fortnight compared to the average value of previous 5 years, Supplemental irrigation may be given to protect already transplanted vegetables.  Liberal application of FYM may be done to conserve moisture as well as to supply the micro nutrients. Micro nutrient sprays may also be given to banana and vegetables through banana special and vegetable special respectively. The weather data of the fortnight was suitable for the cultivation of Oyster Mushroom (Pleurotus spp.), Paddy straw mushroom (Volvariella spp) and Milky mushroom (Calocybe indica).

Incidence of pests and diseases

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

Mango stem borer

This period coincides with the emergence of adult beetles of trunk borer, Batocera  rufomaculata. Plug active holes (can be diagnosed with the presence of fresh hewed wood material and excreta) with cotton dipped in Dichlorovos*/Chlorpyrifos @ 5ml/L and close with mud. In case of severe infestation IIHR developed Sealer cum healer can be used. (Note: * Dichlorovos is banned completely w.e.f 31st Dec., 2020)

Fruit fly on cucurbits

  • For the management of fruit fly (Bactrocera cucurbitae) on cucurbits, following integrated approach may be followed. Installing 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.

Chilli Thrips

  • Spray fipronil 5SC (1.5 ml/l) or imidacloprid 200 SL (0.3 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.

Root-knot nematode in Okra

  • Seed treatment with Trichoderma harzianum  or Pseudomonas fluorescens @ 15-20g/kg seed.
  • Soil application of 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/sqm. The same can be thoroughly filtered and sent along with drip or sprayed.

Whitefly on Gerbera (polyhouses)

  • Spray diafenthiuran @ 1 g/l followed by dinetofuran 1g/litre
  • Install yellow sticky traps coated with adhesive or sticky glue at crop canopy level for monitoring adult whitefly population.

Rose Thrips

  • Spray imidacloprid 17.8 ml/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.

Midge on crossandra

  • Incidence of midge is increasing on crossandra. For its management spray imidacloprid @ 0.5 ml/l.

Disease Scenario

Disease forecast based on weather parameters during the second fortnight of July, 2017.

Fruit Crops

Grape

  • Grapevines needs to be protected against the infection of (i) downy mildew: by the application of 0.4g Dimethomorph  + 2.00 g Mancozeb /l or Metalyxl + Mancozeb (0.2%)/ Al Fosetyl (0.2%) along with sticker @ 0.5 ml/ l. Lower surface of the leaves on the vines to be sprayed properly (ii) anthracnose: spraying with Propineb (0.2%)/ Chlorothalonil (0.2%)/Carbendazim (0.1%)/ Thiophanate methyl (0.1%) are effective along with sticker @ 0.5 ml/ l. (iii) Rust (on var Bangalore Blue): treatment with Chlorothanonil (0.2%) or Bitertanol (0.2%).

Pomegranate

  • Intensity of leaf and fruit spot disease caused by Pseudocercospora punicae and anthracnose of fruit and leaf (C. gloeosporioides) needs attention. Application of Chlorothanonil (0.2%) /Propineb (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.
  • Fresh Bacterial blight infection can be seen due to rains. That requires continuous attention. Application of COC (0.2%) + Streptocycline (300 ppm) /l along with the sticker @ 0.5ml/l should be applied at the interval of 15 – 20 days.

Papaya

  • Foliar, fruit as well as internal infection of Anthracnose (C. gloeosporioides), Black spot (Asperisporium caricae) may advance. Application of Chlorothalonil (0.2%)  Carbendazim (0.1%)/ Thiophanate methyl (0.1%)/ Hexaconazole (0.1%) along with the sticker @ 0.5ml/l with good coverage of the lower surface of the foliage is recommended.

Sapota

  • There was no appreciable change in the intensity of leaf spot (P. indicia) disease compared with last fortnight. Application of Zineb (0.3%) or Ziride (0.4%) along with sticker (0.5 ml /l) are recommended for their management.

Vegetable Crops

Tomato

  • Foliar application of copper oxychloride (0.3%) or Chlorothalonil (0.2%) or Mancozeb (0.2%) or Propineb (0.2%) or Metiram (O.2%) or Pyraclostrobin + metiram (0.2%) at fortnightly interval will reduce the spread of early leaf blight of tomato caused by Alternaria species.  To prevent the late blight caused by Phytophthora infestans spraying of Mancozeb (0.2%) or Copper oxychloride (0.3%), Copper hydroxide(0.2%) or Fosetyl-Al (0.2%) or Pre-packed mixture of Metalaxyl­+Mancozeb (0.2%) may be carried out that may reduce the risk of serious infection expected in the later part of the season. Spraying of acephate at .01% or imidacloprid at 0.03% will reduce the tospovirus infection spread by thrips.

Chillies and capsicum

  • To prevent the leaf blight by Phytophthora capsici spraying of Mancozeb (0.2%) or Copper oxychloride (0.3%), Copper hydroxide(0.2%) or Fosetyl-Al (0.2%) or Pre-packed mixture of Metalaxyl­Mancozeb (0.2%) may be carried out that may reduce the risk of serious infection expected in the later part of the season.  Spray of insecticides like Monocrotophos (0.15%), Acephate (0.15%) or Hostothion (0.1 %) at fortnightly intervals after transplanting, until the flowering stage will reduce vector transmitted viral diseases incidence.

Onion

  • Application of fungicides such as Chlorothalonil (0.2 %) or Propineb (0.2 %) or Mancozeb (0.2%) at fortnightly intervals from onset of the disease may reduce the purple blotch or Stemphylium leaf blight.

Cucurbits

  • Spraying of Chlorothalonil (0.2%) or Mancozeb(0.2%) or Metalaxyl -Mancozeb(0.2%) or Fosetyl-AI (0.2%) or Cymoxanil- mancozeb(0.2%) l0-day intervals from onset of downy mildew will reduce the damage.

Floriculture

Rose

  • To avoid the black spot in rose prophylactic spray with contact fungicides will help (chlorothalonil or mancozeb at 0.2%) along with sticker. If severe cases trifloxystrobin+tebuconazole at 0.1% at 15 days interval will reduce the disease incidence.

Marigold

  • To avoid the spread of Alternaria blight prophylactic spray with chlorothalonil or mancozeb at 0.2% at 15 days interval will help.

Updated on 07.08.2017

 

 

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