Bactericera cockerelli (tomato potato psyllid, TPP) is a serious pest of potato crops, causing feeding damage and also vectoring Candidatus Liberibacter solanacearum, the causal agent of the Zebra Chip (ZC) disease in potatoes. The results of 6 years of early and main crop potato trials at Pukekohe, New Zealand, are summarised and damage caused by TPP is reported. Results show that spring-sown (early) potato crops do not require insecticides. In main crop summer trials we tested action thresholds based on 10 and 20 TPP nymphs per 100 middle leaves but the incidence of ZC damage was commercially unacceptable, ranging from 4 to 9 %. Subsequently we tested an action threshold of >3 TPP adults per yellow sticky trap per week that led to ZC damage ranging from 0.9 to 1.6 %. We also compared monitoring of TPP using sticky trap catches with a degree day model started in mid winter (1 July) for forecasting generation times of TPP. On the basis of the field trial results, we recommend that from early summer onwards, the timing of the first foliar application of insecticide needs to be applied early enough to protect main crop potatoes from the first generation of TPP that occurs after potato tubers have emerged (at Pukekohe, this is the third TPP generation from 1 July when using degree day modelling). Three years of main crop trials indicate that an action threshold of >3 TPP per trap per week provides effective TPP/ZC management in the Pukekohe region when used in conjunction with natural enemies and an insecticide programme that features the use of selective insecticides.Resumen Bactericera cockerelli, (el psílido del tomate y de la papa, TPP), es una plaga seria en los cultivos de papa, causando daño al alimentarse y también como vector de Candidatus Liberibacter solanacearum, el agente causal de la enfermedad de la Zebra Chip (ZC) de papa. Se resumen los resultados de seis años de ensayos en cultivos tempranos y de principales fechas de siembra de papa en Pukekohe, Nueva Zelandia, y se reporta el daño causado por TPP. Los resultados muestran que los cultivos de fechas tempranas de siembra en primavera no requieren de insecticidas. En los ensayos de las fechas principales del verano probamos niveles críticos de acción basados en 10 y 20 ninfas de TPP por 100 hojas intermedias, pero la incidencia del daño por ZC fue inaceptable comercialmente, variando de 4 al 9 %. Subsecuentemente, probamos el límite crítico de acción de> 3 adultos de TPP por trampa adherente amarilla por semana que condujera a niveles de daño con variación de 0.9 a 1.6 %. También comparamos el monitoreo de TPP utilizando trampas de captura adhesivas con un modelo de un grado por día empezando a la mitad del invierno (1°de julio) para predecir los tiempos de generación de TPP. Con base a los resultados de los ensayos de campo, recomendamos que, a partir del principio del verano en adelante, el tiempo para la primera aplicación foliar de insecticida necesita hacerse lo suficientemente temprano para proteger al cultivo de papa de la fecha principal, de ...
A main crop summer potato trial at Pukekohe assessed the damage caused by Bactericera cockerelli tomato potato psyllid (TPP) and investigated the use of action spray thresholds Five treatments were used infurrow insecticide and weekly blocks of foliar sprays; infurrow insecticide and one of three different thresholdbased foliar spray programmes; and no insecticides The thresholdbased spray programmes used either the number of TPP nymphs per middle leaf or the mean number of TPP adults per yellow sticky trap per week plus different modeofaction insecticide rotations Three treatments resulted in acceptable yield and specific gravity and a low incidence of zebra chip disease (ZC) These were the weekly treatment and two spray programmes based on a threshold of >3 TPP adults per trap per week where insecticide applications were reduced by 50 compared to the weekly applications
The tomato/potato psyllid Bactericera cockerelli (Sulc) (Hemiptera Triozidae) is an introduced pest of solanaceous crops in New Zealand A range of established plants play host to Bactericera cockerelli including three traditional Maori food sources taewa or Maori potatoes (Solanum tuberosum ssp andigena) kumara (Ipomoea batatas) and poroporo (Solanum aviculare) Taewa and kumara are highly susceptible to summer B cockerelli infestation whilst poroporo an evergreen plant remains susceptible yearround and provides overwintering refuge Extensive monitoring of each host plant was carried out to determine the significance of each host in the lifecycle of B cockerelli in New Zealand Poroporo was monitored from late autumn for 6 months to determine if the plant served as a significant overwintering host for the pest after harvesting summer crops Taewa and kumara plants were monitored throughout the summer growing season on a weekly basis increasing to twice a week as populations proliferated Host plants were monitored both in the natural environment and under laboratory conditions Data collected contributed to tracking population development of B cockerelli on each host including the length of each life stage (ie egg nymph adult) Comparisons between the three hosts revealed host preference host suitability and the significance of each host in the lifecycle progression of B cockerelli
The brown marmorated stink bug (BMSB) Halyomorpha halys (Heteroptera: Pentatomidae) is an invasive pest in North America and Europe that damages many plant species and invades human dwellings. It is regularly intercepted at Aotearoa/New Zealand’s borders but is not yet known to have established. Māori are partners in New Zealand’s biosecurity community and an understanding of the potential impact of any invasive alien species to their interests is essential. The known impacts of BMSB in published literature were reviewed with a focus on Māori plant taonga (valued or treasured plant species) in: (1) Māori commercial enterprises; (2) mara kai (food gardens); and (3) the natural estate. Many fruit and some vegetable species are likely to be affected by BMSB in commercial and non-commercial Māori horticulture but the impact of BMSB on indigenous/native and other taonga plant species in mara kai and the native estate is difficult to evaluate. BMSB poses a serious economic threat to some crop species of commercial value to Māori, as well as threat to some native taonga species. A kaupapa Māori approach examining unpublished mātauranga (knowledge) would considerably broaden this understanding. He ngārara raupatu kaha nei i te tini o ngā tipu, te urutomo noa i te hunga tangata te ngārara nei. Ka kaha haukotingia te ngārara nei e te mana ārai o Aotearoa heoi anō, kāore anō kia whakawhenua i a ia. E mahi tahi ana a Māori rāua ko te hapori marukoiora, anō hoki e mārama ana i te mōrearea o ngā tipu tauiwi - e whai pānga kia rātou. Te Tukanga. I arotake i ngā tuhinga e hāngai ana ki ngā kopuratanga e mōhio nei - e Māori ai te titiro o roto: (1) ngā pākihi Māori (2) ngā māra kai (3) te taiao anō hoki. Te Whakautu. He maha hoki ngā huawhenua me ngā huarākau ka pāngia e te BMSB o roto i ngā pākihi, i ngā ahuone Māori heoi anō, te taea te whakatau i ngā pānga o te BMSB ki te iwi taketake me ōna taonga o roto i ngā māra kai. Te Whakakapinga. Kei tino raru ētahi tipu e whai pānga ki te Māori, ngā tipu taketake anō hoki i te BMSB. Mā te tirohanga Māori e whakawhānui i ngā mōhiotanga.
An early season potato trial at Pukekohe assessed the damage caused by Bactericera cockerelli tomatopotato psyllid (TPP) and investigated the need for insecticide treatment Four treatments were used insecticide drench at planting; insecticide drench and weekly foliar sprays; insecticide drench and thresholdbased foliar sprays; and no insecticides TPP and associated insects in the trial were monitored weekly using yellow sticky traps and sampling plants from midOctober until midDecember 2011 TPP adult catches remained very low reaching 15 per trap per week in December and egg and nymphal infestations were absent or very low Other exotic psyllid species dominated trap catches in December The predator Micromus tasmaniae (brown lacewing) was the most common insect present throughout the trial peaking at a combined total of 66 eggs and adults per plant No damage was caused by TPP in any treatments indicating that insecticides may not be required to produce healthy early crop potatoes at Pukekohe
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