Laeveld
Agrochem

Latest crop protection developments in the subtropical fruit industry of South Africa

A part of: ,

by Schalk Schoeman

Mango bark beetle (Hypocryphalus mangiferae)

  • Involved with tree mortalities in Malelane and possibly Pongola areas
  • May transmit mango wilt Ceratocystis manginecans
  • First noticed July 2019
  • Farmers sprayed and destroyed dead and moribund trees
  • So far no recurrence have happened

Bark borers

  • Numbers appear to be increasing but not the pshb
  • Sent various samples to FABI
  • Probably related to plant stress, drought, heat
  • Macadamia researchers in Hawaii and Australia made similar observations
  • Need a country wide surveillance
  • General lure will work but will attract all beetles – molecular techniques are quite expensive
  • Will probably go into a wetter phase and suspect beetle problems to decrease

Tomato semi-looper (Chrysodeixis acuta)

Banana bunchy top virus and Pentalonia nigronervosa

  • Colonies at base of plants under old leaf sheaths
  • Move upwards when population increases
  • Banana handbook mention chlorpyrifos
  • * Imidachloprid injections used for aphid control
  • Possibility of using entomopathogenic fungus for control of colonies

Banana slug

  • Main issue is the change in the method how residue samples are taken.
  • Wholesalers are picking up residues of slug pellets

False codling moth & Avocados

Damage

  • Definite preference for certain cultivars – Pinkerton & Maluma Hass
  • Easy to find on Maluma in Hazyview & Tzaneen
  • Damage in Hazyview ± 20%
  • Appears to facilitate infection of Anthracnose – needs scientific verification
  • Damage in Africa (Tanzania & Northern Mozambique) in certain untreated areas more than 50%
  • Damage potential of this pest is big because it is able to adapt to a new diet
  • Cannot currently complete its life cycle in hard avocados but may do so in future – market access

Thrips in avocados and macadamias

Damage

  • Is becoming a serious issue where macadamias and avocados are cultivated in close proximity.
  • Cosmetic damage in avocados – fruit not fit for export
  • Effect on following crop size on Smaller leaves – reduced photosynthetic area
  • Pruning is central to effective spray Thrips normally severely affect new growth.
  • Suspect resistance – not scientifically proven
  • Dry hot summers – quicker generation time
  • Warmer climate induce trees to flower out of sync – continuous availability of flowers and new flush

Macadamia felted coccid

(Update)

  • ave located parasitoids – very low numbers
  • Secondary sites now beginning to become infected
  • Very heterogeneous distribution
  • Definite cultivar preference
  • Insects prolific during autumn & winter
  • IGR + oil seemed to work very well – not registered

Immediate problems facing the subtropical fruit industry

  • Thrips is an overarching problem and appears to become exponentially more Products are not working – resistance, poor application of pesticides or climatic?
  • False codling moth is becoming a very serious problem for Maluma It is already a serious problem in Africa and may even in future become a quarantine issue
  • Urgent need for the registration of Imidachloprid on bananas
  • Need for the registration of Attract and Kill or Attract and Infect type products for the tomato semi-looper on bananas
  • Are there alternative for slug bait in bananas?
  • Need for registration of products against the macadamia felted coccid
  • Need for a chemical with a knock down action that can be used for stink bug monitoring in lieu of dichlorvos
Northern Cape
Western Cape
Eastern Cape
Free State
Gauteng
North-West
Mpumalanga
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More than 100 agents
across South Africa

Laeveld Agrochem’s agents (franchisees) are qualified agronomists accredited by CropLife South Africa (formerly AVCASA).

In each region, agents receive support from experienced Business Managers, enabling detailed recommendations for both corrective and proactive measures on the farm.

Operating as a franchise business model, our dedicated team can assist growers with detailed recommendations to optimise yield per hectare.

Through strategic collaboration with our technology partner, Agri Technovation, we offer innovative solutions such as MyFarmWeb™ and Picklogger™, tailored to meet the evolving needs of modern agriculture.

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