in capsicums why we want keep it available Capsicum acreage - - PowerPoint PPT Presentation

▶

Nov 14, 2022 373 likes •522 views

Dichlorvos and methamidophos in capsicums why we want keep it available Capsicum acreage greenhouses Total New Zealand 55 ha Two main growers/exporters, Southern Paprika and NZ Gourmet 41 ha Both companies producing in different

SLIDE 1

Dichlorvos and methamidophos in capsicums why we want keep it available

SLIDE 2

Capsicum acreage greenhouses

Total New Zealand 55 ha
Two main growers/exporters, Southern Paprika and NZ

Gourmet 41 ha

Both companies producing in different countries
Working in a growth market both companies expanded last

year and this year

Export 60 – 70% mainly Japan export value about 20 - 25

million.

Employing over 200 staff

SLIDE 3

Insect control

Residue is a big issue in export market

especially Japan

For this as much Integrated Pest Management

as possible

Clean start of a new crop and use of two

predators Phytoseiulus persimilis and Cucumeris barkeri

SLIDE 4

IPM

Clean start essential
Introduction of predators at propagation
Weekly introductions of predators
In case of small insect infestations, spot sprays

abamectine/milbemectine/Success or Oberon (Psyllid)

Large infestations dichlorvos (summer conditions)
Clean out after last pick with methamidophos

SLIDE 5

Advantage dichlorvos

Limited side effect on predators
No negative effect of residue on leaves for introduction
f predators next day following a treatment
Strong vapour effect and good efficacy
Low residue levels on fruit, as a grower we test

samples for residue on a monthly basis, never found residues above MRL

SLIDE 6

Application technique

Pulse foggers, semi automated equipment vapourising

the chemical

Limited number of rows treated in full grown crop for

young crop treating an area up to 1.5 ha at a time (automated)

Foggers filled/loaded in controlled area
Using foggers means less active used compared to

spraying

Some growers use LVM but too small to use on large

area’s 1500 m2 per unit

SLIDE 7

Staff Protection

Staff fully protected, full PPE covering suits, full

mask and earmuffs

Greenhouse completely closed until chemical has

settled down

Ventilation before staff goes back in the house

minimal 30 minutes all vents open

Treatments usually done on a Friday or Saturday

Check before staff enters after the weekend

Staff applying chemicals regularly have

cholinesterase tests, never results very good no negative effects found

SLIDE 8

Emissions from greenhouse

Dichlorvos has negative effect on aquatic life
Greenhouses are a closed environment

– All drain from substrates/floors are collected and re- used in irrigation  no leaching – Vents are closed after treatment until product has settled down – Active can contaminate condense on the glass, all condense is collected by means of a condense gutter and this water goes into the irrigation supply where chemicals can break down

SLIDE 9

Predators used

SLIDE 10

Foggers

SLIDE 11

Fogging

SLIDE 12

LVM

SLIDE 13

Condense gutter

SLIDE 14

Summary

Dichlorvos is essential in running an IPM program and

avoiding or keeping residue’s as low as possible

Low residue on crop and fruit
Safe way of application
No emission from greenhouses
Loss of Dichlorvos will mean IPM program will be

shorter and more less effective chemicals will be used

IPM means no risk off resistance so “soft” chemicals