2019 winter irrigated soybean, Home Hill

Posted in PulseCheck–Coastal on Sep 20, 2019

2019 winter irrigated soybean on cracking clay at Home Hill

Grower: James Ware

Locality of the crop: Home Hill

Farming system: Irrigated grain and sugarcane production system. Legumes (soybean & mungbean) are grown in rotation with sorghum, corn and millet.

Monitored area: 40.3 ha.

Soil type: Main soil type is a cracking clay soil with smaller areas of loam over sodic clay.

Pre-plant actions:

  • Fallow sprays (glyphosate and 2,4-D)
  • Bed formed for irrigation/planting operations post fertiliser application from previous soil test.
  • Previous crops were soybeans in the 2018 June/July planting window then grain sorghum and now back to soybean.

Planting

Variety: Hayman. Planted 28 June 2019.

Sowing method: Maxemerge disc planter.

Sowing rate: 70 kg/ha at 50 mm depth into dry soil and watered up.

Inoculant: Easy Rhiz soybean Group H inoculant + Regent (fipronil insecticide), water injection.

Nutrition: Pre-plant application of nitrogen, phosphorus, potassium, sulphur and zinc.

Post-plant weed control

Herbicides: Verdict and Blazer applied at V2/3 growth stage (two or three sets of unfolded trifoliolate leaves).

Week 7

  • Second in-crop irrigation was applied.
  • No insecticide sprays as yet.

A GDOT sensor used to schedule irrigations.

Week 8

Management notes:

  • Crop is healthy and growing well.
  • First flowers have appeared.
  • Heliothis activity spiked, which resulted in an application of Altacor.
  • Low levels of Redbanded Shield bug are also present in the crop.
  • Third in-crop irrigation was completed. Based on information from the GDOT, irrigation frequency is now escalated to weekly.

Heliothis activity has required control measures. Follow the resistance management guide to extend the life of available chemistry.

Week 9

  • Crop is green, healthy and growing well with the advent of warmer temperatures.
  • Downy mildew is evident throughout the canopy, however control with a fungicide is not warranted.
  • A small population of Redbanded shield bugs have been observed during both crop inspections this week. Numbers are currently under threshold and will be monitored closely.
  • Heliothis, armyworm & looper activity are practically non-existent since the Altacor application last week. Foliar and terminal damage is still evident within the canopy with significant new growth occurring.
  • Some late germinating vines and annual grasses are also evident but densities are extremely low and will not require or justify a herbicide application.
  • Weekly 'flushing' irrigations continue to occur during this critical reproductive phase.

Left: Redbanded shield bug. Right: Downy mildew.

Week 10

  • Crop is flowering and podding well.
  • Insect pressure remains low, however an adult Lucerne crownborer was found during inspections. No obvious signs of larvae damage from Lucerne crownborer activity as yet. The seed for this crop was treated with fipronil at planting.
  • Irrigations are now scheduled for twice-weekly.

An adult lucerne crown borer was found in the crop but no larvae damage found. No in-crop insecticides are registered for crown borer.

Week 11

  • Crop continues to flower with ideal growing conditions.
  • Heliothis and looper numbers remain low.
  • Green vegetable bug & red banded shield bugs are regularly found during checks but remain under threshold. Nymphs are starting to appear so an insecticide may not be too far off.
  • Finding a lot of seed eating bugs (Graptostethus servus). The seed eating bug is potentially damaging to grain crops such as soybean, mungbean and sorghum. No thresholds exist so we will have to watch this insect closely.
  • Also found a few horehound bugs (Agonoscelis rutile), which feed on the horehound plant (Marrubium vulgare) and not soybeans.
  • Irrigation to continue twice weekly during flowering.

Left: Seed eating bug. Right: Horehound bug.

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