{'fraction_non_alphanumeric': 0.038616251005631534, 'fraction_numerical': 0.013676588897827836, 'mean_word_length': 5.5473684210526315, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Functional relationship between pest abundance, plant physiology and yield as exemplified by the greenhouse whitefly, Trialeurodes vaporariorum Westw. (Hom., Aleyrodidae)

Influence of greenhouse whiteflies (Trialeurodes vaporariorum Westwood) on cucumber plants is approached as a case study. Pest abundance is expressed as BD, the total integrated area below the population biomass curve (to incorporate age structure) against time. BD is tested for correlation with 5 plant physiological indices, which were also tested for correlation against yield and quality of the cucumbers. Based on these results, the damage threshold (DT) is estimated as BD = 54917 mg. days of pest biomass. The injury threshold (IT) is calculated as Ph (integrated photosynthetic rate, the most sensitive factor relating BD and yield) = 144.06 (mg. dm‐2.h‐1) × days, a decrease to 81.20% of the photosynthetic rate under control (no pest infestations). Through computer simulations of insect population dynamics, the influence of temperature, initial population density and age structure is approached. The relationship between plant intrinsic physiological characteristics and plant external features (growth indices) under pest infestations is also investigated.