In a mixed plantation of Novogruzinskii lemons, Unshiu mandarins and Washington Navel oranges up to 88.2% of lemon, 13.9% of mandarin and 11.9% of orange trees were affected by mal secco [Deuterophoma tracheiphila].

In controlled trials lemon trees receiving OP-M-Fe-Mn or Fe-DTPU chelates [not defined] at 40-50 ml/tree showed resistance to mal secco [Deuterophoma tracheiphila] compared with the control, and 2 months after artificial infection no symptoms of the disease were observed on the treated trees...

This lemon variety on its own rootstock and on seedlings of Duncan [grapefruit] was characterized by prolonged and uninterrupted growth, whereas on Poncirus trifoliata and Ponderosa [lemon] the separate growth phases in the annual development cycle were more restricted and the plants produced...

In studies with plants growing in unfertilized soil the greatest N and P contents were found in young persimmon leaves, but they declined towards the end of the growing period. The K content was almost unchanged. Under NPK fertilization N accumulated readily in young leaves, less readily and again...

Varieties with resistance to Deuterophoma tracheiphila had a much higher total and protein N content than susceptible varieties and showed little reduction in this after infection. Free amino acid content was higher in the susceptible varieties and fell after infection.

The total flavonoid content of the leaves of P. incarnata before flowering was 0.22%, and that of the roots was 0.35%. During flowering the content of the leaves was 0.31, of the flowers 0.23 and of the roots 0.21 %. At the start of fruiting the leaves contained 0.15 and the roots 0. 13%. Paper...

The varieties studied differed in response to artificial infection with the fungi causing gummosis, viz. Macrophoma mantegazziana, Phomopsis [Diaporthe] citri and Sphaeropsis malorum [Botryosphaeria obtusa]. Susceptible varieties showed a breakdown of the cortical tissue, darkening of the wood and...

Isolates of P. [Deuterophoma] tracheiphila, from lemon, orange, mandarin and grapefruit, differed in morphology, assimilation of carbon and nitrogen, and pH requirements, 4 forms of the fungus being distinguished.

In 4-year trials a fertilizer dressing given as split applications twice or thrice annually increased cucumber respiration more than a similar dressing applied once. The cucumber ascorbic acid content was greatest in plants receiving 2 applications. The treatments had no effect on catalase activity.

High temp (30-35 deg C) was the main factor inducing formation of a Cephalosporium state in pure cultures of V. diospyri (a new sp.) and V. sp.