Territory Stories

Technical annual report 2000-01

Details:

Title

Technical annual report 2000-01

Collection

Dept. of Regional Development, Primary Industry, Fisheries and Resources technical annual report; Department of Regional Development, Primary Industry, Fisheries and Resources technical and annual report; Reports; PublicationNT; Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295

Date

2001-10

Description

Made available via the Publications (Legal Deposit) Act 2004 (NT).

Notes

Date:2001-10

Language

English

Subject

Agriculture -- Northern Territory -- Periodicals; Fisheries -- Northern Territory -- Periodicals

Publisher name

Dept. of Primary Industry and Fisheries

Place of publication

Darwin

Series

Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295

ISSN

0158-2763

Copyright owner

Check within Publication or with content Publisher.

Parent handle

https://hdl.handle.net/10070/223369

Citation address

https://hdl.handle.net/10070/687151

Page content

Department of Primary Industry and Fisheries 148 Lemons Most of the mature varieties had reached the Australian standard for juice percentage (33%) by midFebruary (Table 3). However, the younger trees, including Fino, Verna, and young Lisbon, were slow to mature. Table 3. Juice percentage for lemon cultivars 2000 2001 Cultivars/Rootstocks Mid February (%) Mid April(%) Mid February(%) Mid May (%) Lisbon/Troyer Citrange (Mature) 29 39 32.5 42.3 Lisbon/Citrange (Mature) 31 35 34.5 41.6 Eureka/Citrange (Mature) 23 38 38.0 41.7 Fino/Citrange (Young) N/A N/A N/A 44.6 Verna/Citrange(Young) N/A N/A N/A 37.4 Lisbon/Citrange (Young) N/A N/A N/A 42.2 The yield data for 2001 (Table 4) shows that Eureka out-performed all other cultivars for mature trees. Also, Lisbon seems to perform better when Citrange is used as a rootstock compared with Troyer Citrange. It is difficult to draw conclusions from the data presented in Table 4 for the young trees: Fino, Verna and Lisbon, as this was their first year of production. Table 4. Yield data for lemons for 2001 Scion/Rootstock Fruit No Yield (kg) Average fruit weight (g) Lisbon/Troyer Citrange (Mature) 380 58.1 155 Lisbon/Citrange (Mature) 558 77.8 149 Eureka/Citrange (Mature) 1048 175.0 168 Fino/Citrange (Young) 378 46.8 125 Verna/Citrange (Young) 219 29.6 137 Lisbon/Citrange (Young) 295 47.4 160 Pest and Disease: The occurrence of both Citrus Leafminer (Phyllocnistis citrella) and large populations of Queensland fruit fly (Bactrocera trioni) deserve a mention, as they either reduced net productivity or fruit quality. Pest management programs are being implemented to deal with these pests, particularly for Citrus Leafminer, which was recorded for the first time in Alice Springs this season. Future Work: As mentioned above, a number of trees in the planting are only in their first year of production. Assessment of these trees will continue for another three years, while the older trees will be assessed for one more year only. New trials using deficit irrigation to promote flowering, increase yields and reduce water consumption for lemon cultivars are planned for 2001/2002.