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Item A study of the leafspot disease of lettuce caused by Stemphylium botryosum Wallr. : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science in the University of New Zealand, Massey Agricultural College(Massey University, 1961) Slade, Donald ArthurLettuce (Lactuca stavia L) is the most important salad crop and a principal vegetable of New Zealand where in many districts it can be grown out of doors all the year round. Winter lettuce growers commonly plant from 1/2 - 5 acres of lettuce, and a good crop will cut 400 cases an acre. In late winter and early spring when other vegetables are scarce, returns to the grower from lettuce may be as high as 20/- to 60/- a case. Returns per acre from winter lettuce are therefore relatively high compared with other winter crops. The success of this crop is of major importance to the grower who commonly depends on it to cover the high winter and spring labour expenses which usually coincide with a period of low production. From season to season and even from week to week in the same season, the quality and quantity of lettuce available is a direct reflection of the prevailing weather conditions. Weather may act directly on the lettuce plant affecting its rate of maturation, appearance and plant size. Weather may also have a profound indirect effect by providing conditions conducive to disease development. It is well recognised that a disease may reach epiphytotic proportions only if weather conditions are favourable to the causual organism. [From Introduction]Item Studies on the dieback of Lacebarks, Myxosporium hoheria. n.f.sp / by "Assured"(Massey University, 1932) Atkinson, John DunstanThe Maori names Houi, Whauwhi and Houhere, or the settlers terms lacebark, and ribbon-wood, cover several species of flowering plants belonging to the order Malvales. These species, which are all indigenous to New Zealand, fall into the genera Hoheria, and Plagianthus, Laing and Blackwell (1927) list the following eight speoiess: Hoheria populnea. Hoheria glabrata. do sexstylosa. do Allanii. do angustifolia. Plagianthus divaricatus. do Lyallii. do betulinus. H.Populnea is found chiefly in the Auckland and North Auckland districts, as a member of the subtropical rain forest, but Laing has recently recorded its occurrence in Karamea. H.sexstylosa occurs throughout both islands as a member of the lowland bush communities. H.angustifolia is typically a South Island plant found in large numbers on Banks penninsula, but is also found in the south of the North Island. H.Lyallii is a deciduous shrub growing in the mountainous districts of the South Island. H. glabrata belongs to the subalpine flora, growing usually in situations where it can obtain abundant light, e.g. recent landslips. Cockayne (1928). H.Allanii is a small leaved shrub recorded from the Rakaia gorge, Canterbury. [From Introduction]Item Studies on Stemphylium leaf spot and Leptosphaerulina pepper spot, two foliage diseases of lucerne : a thesis presented in partial fulfilment of the requirements for the degree of Masterate of Agricultural Science at Massey University(Massey University, 1974) Whitwell, Phillip DonaldOver recent years the area of lucerne (Medicago sativa L.) grown in New Zealand has rapidly increased (Table 1) as farmers and commercial firms have realised the many and varied virtues of this crop in farming enterprises. TABLE 1. Areas of lucerne grown in New Zealand used for hay, silage and seed production. Year Area (acres) Authority 1953-59 144,516 N.Z. Year Book, 1963 1963-64 164,860 N.Z.Year Book,1969 1968-69 202,770 N.Z. Year Book, 1971 1970-71 300,000 Meeklah & Allen, 1971 Lynch (1967) estimated that if the present trend continued a lucerne area of at least 300,000 acres could be expected by 1977. However, this area was attained by 1970, and the increased rate of expansion can be accounted for in several ways: 1. Due to its agronomic features lucerne is primarily grown in free-draining soils subject to an unreliable summer rainfall, so ensuring a continued feed supply over this period. 2. Lucerne has a greater versatility than most crops within a farming enterprise in that it can be utilised in several ways; for example, hay and silage, grazing, seed production, and more recently for lucerne meal or pellets, and protein extraction. 3 A gross margin analysis of lucerne as a cash crop indicates a return comparable with, or better than, such other popular crops as wheat or peas (Lamb, 1969; Tocker, 1970; Anon, 1970; Anon, 1972). [From Introduction]Item Flower blight of chrysanthemums : the causal fungi and their control : a thesis presented in partial fulfilment of the requirements for the degree of Master of Agricultural Science at Massey University(Massey University, 1973) Singh, GurmitThe commercial chrysanthemum commonly grown in New Zealand is botanically identified as Chrysanthemum morifoliurr. Ramat. and is believed to have originated in China. As the family name Compositae suggests the individual flower ('flower head') is a composite arrangement of two types of florets, namely ray florets with well developed petals, and disc florets with tubular or poorly developed petals. Production of commercial chrysanthemums basically comprises three categories: (i) cut flowers; (ii) cuttings; (iii) container or pot plants. Chrysanthemums are probably grown by more floriculturalists than any other flower crop. Much of its popularity is attributed to the wide range of colours and forms and the fact that it can be grown either as a pot plant or for cut flowers. Another important characteristic of the chrysanthemum is the long keeping quality of the flowers, a feature which is much appreciated by retailers and consumers. In the United States of America the chrysanthemum or 'mum' is the most popular flower, surpassing both the rose and carnation in total wholesale value. [FROM INTRODUCTION]